Bug 79311 - Call trace originating from i915 referencing intel_wait_for_vblank()
Summary: Call trace originating from i915 referencing intel_wait_for_vblank()
Status: RESOLVED CODE_FIX
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - Intel) (show other bugs)
Hardware: x86-64 Linux
: P1 normal
Assignee: Ville Syrjala
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-07-01 00:40 UTC by Alan Bartlett
Modified: 2015-01-23 02:00 UTC (History)
4 users (show)

See Also:
Kernel Version: From 3.16 to 3.17-rc4
Tree: Mainline
Regression: Yes


Attachments
dmesg output (81.34 KB, text/plain)
2014-07-01 00:40 UTC, Alan Bartlett
Details
Output returned by lspci -nnv (884 bytes, text/plain)
2014-07-01 00:42 UTC, Alan Bartlett
Details
dmesg output, 3.16-rc7 (94.82 KB, text/plain)
2014-07-28 14:42 UTC, Alan Bartlett
Details
dmesg output, linux-3.17 (80.71 KB, text/plain)
2014-08-04 16:17 UTC, Alan Bartlett
Details
dmesg output, linux-3.16 (80.71 KB, text/plain)
2014-08-04 16:20 UTC, Alan Bartlett
Details
dmesg, after booting with drm.debug=0xe passed to kernel (169.19 KB, text/plain)
2014-08-07 16:21 UTC, Alan Bartlett
Details
dmesg; drm.debug=0xe passed to kernel at boot (155.39 KB, text/plain)
2014-08-15 12:32 UTC, Alan Bartlett
Details
dmesg; drm.debug=0xe passed to kernel at boot (156.86 KB, text/plain)
2014-08-27 20:55 UTC, Alan Bartlett
Details
[PATCH] drm/i915: Wait for vblank before enabling the TV encoder (866 bytes, patch)
2014-09-05 15:26 UTC, Ville Syrjala
Details | Diff
[PATCH] drm/i915: Wait for vblank after enabling the TV encoder (832 bytes, patch)
2014-09-05 15:27 UTC, Ville Syrjala
Details | Diff
dmesg file, 3.17.0-0.rc3.149301.patch.el7.elrepo.x86_64 (88.51 KB, text/plain)
2014-09-05 20:56 UTC, Alan Bartlett
Details
traces, 3.17.0-0.rc3.149301.patch.el7.elrepo.x86_64 (11.77 KB, text/plain)
2014-09-05 21:00 UTC, Alan Bartlett
Details
Trace, from RHEL-6 system. (2.62 KB, text/plain)
2014-09-08 20:14 UTC, Alan Bartlett
Details
Trace, from RHEL-7 system. (2.82 KB, text/plain)
2014-09-08 20:15 UTC, Alan Bartlett
Details

Description Alan Bartlett 2014-07-01 00:40:54 UTC
Created attachment 141571 [details]
dmesg output

Hardware -- Dell Latitude E5500

lspci -nn | grep Graphics returns --

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
00:02.1 Display controller [0380]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a43] (rev 07)

Call trace --

[   10.603031] ------------[ cut here ]------------
[   10.603078] WARNING: CPU: 1 PID: 270 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   10.603081] vblank wait timed out
[   10.603082] Modules linked in: snd_hda_intel(+) snd_hda_controller i915(+) snd_hda_codec snd_hwdep arc4 snd_seq snd_seq_device iwldvm snd_pcm mac80211 dell_laptop dcdbas iwlwifi coretemp i2c_i801 cfg80211 kvm_intel dell_wmi tg3 iTCO_wdt sparse_keymap iTCO_vendor_support sdhci_pci ppdev i2c_algo_bit sdhci kvm drm_kms_helper drm snd_timer rfkill ptp mmc_core i2c_core pcspkr snd pps_core joydev wmi serio_raw lpc_ich mfd_core shpchp parport_pc parport acpi_cpufreq soundcore video xfs libcrc32c sd_mod sr_mod cdrom crc_t10dif crct10dif_common ahci libahci libata firewire_ohci firewire_core yenta_socket crc_itu_t
[   10.603138] CPU: 1 PID: 270 Comm: systemd-udevd Not tainted 3.16.0-0.rc3.el7.elrepo.x86_64 #1
[   10.603141] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   10.603143]  0000000000000000 0000000025bdfcb7 ffff8800d8be75e0 ffffffff81652e01
[   10.603147]  ffff8800d8be7628 ffff8800d8be7618 ffffffff81072cbd ffff880119010000
[   10.603151]  0000000000071040 0000000000000003 00000000fffb958b 00000000000000aa
[   10.603155] Call Trace:
[   10.603168]  [<ffffffff81652e01>] dump_stack+0x45/0x56
[   10.603172]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   10.603174]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   10.603197]  [<ffffffffa05e223e>] ? gen4_read32+0x4e/0xc0 [i915]
[   10.603221]  [<ffffffffa05f19b9>] intel_wait_for_vblank+0x209/0x210 [i915]
[   10.603245]  [<ffffffffa0628430>] intel_tv_detect+0x220/0x570 [i915]
[   10.603252]  [<ffffffffa02d0ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   10.603257]  [<ffffffffa02d0be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   10.603262]  [<ffffffffa02d29a0>] drm_fb_helper_probe_connector_modes.isra.3+0x50/0x70 [drm_kms_helper]
[   10.603267]  [<ffffffffa02d3acd>] drm_fb_helper_initial_config+0x15d/0x4d0 [drm_kms_helper]
[   10.603290]  [<ffffffffa05e20e2>] ? gen4_write32+0x52/0xb0 [i915]
[   10.603312]  [<ffffffffa05d0eed>] ? i915_hpd_irq_setup+0xcd/0xe0 [i915]
[   10.603335]  [<ffffffffa060877f>] intel_fbdev_initial_config+0x1f/0x30 [i915]
[   10.603360]  [<ffffffffa062c1ca>] i915_driver_load+0xf4a/0xfd0 [i915]
[   10.603364]  [<ffffffff812fe668>] ? kobject_uevent_env+0x178/0x690
[   10.603368]  [<ffffffff8140c917>] ? get_device+0x17/0x30
[   10.603371]  [<ffffffff814123f5>] ? klist_class_dev_get+0x15/0x20
[   10.603374]  [<ffffffff8164122a>] ? klist_add_tail+0x3a/0x40
[   10.603376]  [<ffffffff8140e2a9>] ? device_add+0x219/0x630
[   10.603392]  [<ffffffffa02714d6>] ? drm_sysfs_device_add+0xd6/0x120 [drm]
[   10.603403]  [<ffffffffa026d9bd>] drm_dev_register+0xad/0x100 [drm]
[   10.603414]  [<ffffffffa027054f>] drm_get_pci_dev+0x8f/0x1f0 [drm]
[   10.603433]  [<ffffffffa05a24bb>] i915_pci_probe+0x3b/0x60 [i915]
[   10.603436]  [<ffffffff81335be5>] local_pci_probe+0x45/0xa0
[   10.603439]  [<ffffffff81336d95>] ? pci_match_device+0xe5/0x110
[   10.603442]  [<ffffffff81336ef9>] pci_device_probe+0xf9/0x150
[   10.603445]  [<ffffffff81411520>] driver_probe_device+0x90/0x3c0
[   10.603448]  [<ffffffff81411923>] __driver_attach+0x93/0xa0
[   10.603451]  [<ffffffff81411890>] ? __device_attach+0x40/0x40
[   10.603453]  [<ffffffff8140f463>] bus_for_each_dev+0x73/0xc0
[   10.603456]  [<ffffffff81410fbe>] driver_attach+0x1e/0x20
[   10.603458]  [<ffffffff81410ba0>] bus_add_driver+0x180/0x250
[   10.603461]  [<ffffffff81412104>] driver_register+0x64/0xf0
[   10.603464]  [<ffffffff8133557c>] __pci_register_driver+0x4c/0x50
[   10.603474]  [<ffffffffa02707ba>] drm_pci_init+0x10a/0x140 [drm]
[   10.603478]  [<ffffffffa0682000>] ? 0xffffffffa0681fff
[   10.603494]  [<ffffffffa0682089>] i915_init+0x89/0x90 [i915]
[   10.603498]  [<ffffffff81002144>] do_one_initcall+0xd4/0x210
[   10.603500]  [<ffffffff811bd69d>] ? kfree+0xfd/0x140
[   10.603504]  [<ffffffff811a3532>] ? __vunmap+0xb2/0x100
[   10.603507]  [<ffffffff810f1b48>] load_module+0x2018/0x2520
[   10.603510]  [<ffffffff810ed530>] ? store_uevent+0x70/0x70
[   10.603513]  [<ffffffff810ee109>] ? copy_module_from_fd.isra.47+0x129/0x180
[   10.603516]  [<ffffffff810f2206>] SyS_finit_module+0xa6/0xd0
[   10.603520]  [<ffffffff8165b069>] system_call_fastpath+0x16/0x1b
[   10.603522] ---[ end trace 7a2e53fef6a4c62b ]---
Comment 1 Alan Bartlett 2014-07-01 00:42:28 UTC
Created attachment 141581 [details]
Output returned by lspci -nnv
Comment 2 Alan Bartlett 2014-07-07 15:11:12 UTC
Updated to linux-3.16-rc4

Call traces --

[   42.437053] ------------[ cut here ]------------
[   42.437101] WARNING: CPU: 0 PID: 1133 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   42.437104] vblank wait timed out
[   42.437106] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq arc4 snd_seq_device iwldvm mac80211 coretemp iTCO_wdt snd_pcm snd_timer iTCO_vendor_support ppdev iwlwifi snd tg3 joydev dell_laptop dell_wmi sparse_keymap kvm_intel dcdbas kvm i915 soundcore sdhci_pci serio_raw cfg80211 i2c_algo_bit sdhci ptp rfkill parport_pc
[   42.437162]  pps_core mmc_core drm_kms_helper i2c_i801 drm lpc_ich pcspkr parport wmi shpchp i2c_core mfd_core acpi_cpufreq video xfs libcrc32c sd_mod crc_t10dif crct10dif_common sr_mod cdrom ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket
[   42.437191] CPU: 0 PID: 1133 Comm: X Not tainted 3.16.0-0.rc4.el7.elrepo.x86_64 #1
[   42.437194] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   42.437196]  0000000000000000 000000005a85972e ffff8800d1fc3a60 ffffffff81652f31
[   42.437201]  ffff8800d1fc3aa8 ffff8800d1fc3a98 ffffffff81072cbd ffff8800d76b0000
[   42.437204]  0000000000071040 0000000000000008 00000000fffc11e5 00000000000000aa
[   42.437209] Call Trace:
[   42.437217]  [<ffffffff81652f31>] dump_stack+0x45/0x56
[   42.437227]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   42.437230]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   42.437245]  [<ffffffffa03692ce>] ? gen4_read32+0x4e/0xc0 [i915]
[   42.437261]  [<ffffffffa0378a49>] intel_wait_for_vblank+0x209/0x210 [i915]
[   42.437278]  [<ffffffffa03af510>] intel_tv_detect+0x220/0x570 [i915]
[   42.437286]  [<ffffffffa0237ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   42.437291]  [<ffffffffa0237be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   42.437308]  [<ffffffffa01fa72f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   42.437311]  [<ffffffff811cf081>] ? __mem_cgroup_commit_charge+0x151/0x3c0
[   42.437319]  [<ffffffffa01eba9c>] drm_ioctl+0x1ec/0x660 [drm]
[   42.437324]  [<ffffffff8121a428>] ? fsnotify+0x238/0x310
[   42.437327]  [<ffffffff811eef80>] do_vfs_ioctl+0x2e0/0x4a0
[   42.437330]  [<ffffffff81282526>] ? file_has_perm+0xa6/0xb0
[   42.437332]  [<ffffffff811ef1c1>] SyS_ioctl+0x81/0xa0
[   42.437336]  [<ffffffff8165b1a9>] system_call_fastpath+0x16/0x1b
[   42.437337] ---[ end trace f6b647fdfdd0528e ]---
[   42.545051] ------------[ cut here ]------------
[   42.545099] WARNING: CPU: 0 PID: 1133 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   42.545102] vblank wait timed out
[   42.545104] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq arc4 snd_seq_device iwldvm mac80211 coretemp iTCO_wdt snd_pcm snd_timer iTCO_vendor_support ppdev iwlwifi snd tg3 joydev dell_laptop dell_wmi sparse_keymap kvm_intel dcdbas kvm i915 soundcore sdhci_pci serio_raw cfg80211 i2c_algo_bit sdhci ptp rfkill parport_pc
[   42.545160]  pps_core mmc_core drm_kms_helper i2c_i801 drm lpc_ich pcspkr parport wmi shpchp i2c_core mfd_core acpi_cpufreq video xfs libcrc32c sd_mod crc_t10dif crct10dif_common sr_mod cdrom ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket
[   42.545189] CPU: 0 PID: 1133 Comm: X Tainted: G        W     3.16.0-0.rc4.el7.elrepo.x86_64 #1
[   42.545192] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   42.545194]  0000000000000000 000000005a85972e ffff8800d1fc3a60 ffffffff81652f31
[   42.545198]  ffff8800d1fc3aa8 ffff8800d1fc3a98 ffffffff81072cbd ffff8800d76b0000
[   42.545202]  0000000000071040 000000000000000c 00000000fffc1251 00000000000000aa
[   42.545207] Call Trace:
[   42.545215]  [<ffffffff81652f31>] dump_stack+0x45/0x56
[   42.545225]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   42.545228]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   42.545243]  [<ffffffffa03692ce>] ? gen4_read32+0x4e/0xc0 [i915]
[   42.545259]  [<ffffffffa0378a49>] intel_wait_for_vblank+0x209/0x210 [i915]
[   42.545276]  [<ffffffffa03af510>] intel_tv_detect+0x220/0x570 [i915]
[   42.545284]  [<ffffffffa0237ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   42.545289]  [<ffffffffa0237be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   42.545305]  [<ffffffffa01fa72f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   42.545309]  [<ffffffff811cf081>] ? __mem_cgroup_commit_charge+0x151/0x3c0
[   42.545317]  [<ffffffffa01eba9c>] drm_ioctl+0x1ec/0x660 [drm]
[   42.545322]  [<ffffffff811eef80>] do_vfs_ioctl+0x2e0/0x4a0
[   42.545325]  [<ffffffff81282526>] ? file_has_perm+0xa6/0xb0
[   42.545328]  [<ffffffff811dd6ee>] ? ____fput+0xe/0x10
[   42.545330]  [<ffffffff811ef1c1>] SyS_ioctl+0x81/0xa0
[   42.545333]  [<ffffffff8165b1a9>] system_call_fastpath+0x16/0x1b
[   42.545335] ---[ end trace f6b647fdfdd0528f ]---
[   42.699050] ------------[ cut here ]------------
[   42.699098] WARNING: CPU: 1 PID: 1133 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   42.699101] vblank wait timed out
[   42.699103] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq arc4 snd_seq_device iwldvm mac80211 coretemp iTCO_wdt snd_pcm snd_timer iTCO_vendor_support ppdev iwlwifi snd tg3 joydev dell_laptop dell_wmi sparse_keymap kvm_intel dcdbas kvm i915 soundcore sdhci_pci serio_raw cfg80211 i2c_algo_bit sdhci ptp rfkill parport_pc
[   42.699159]  pps_core mmc_core drm_kms_helper i2c_i801 drm lpc_ich pcspkr parport wmi shpchp i2c_core mfd_core acpi_cpufreq video xfs libcrc32c sd_mod crc_t10dif crct10dif_common sr_mod cdrom ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket
[   42.699189] CPU: 1 PID: 1133 Comm: X Tainted: G        W     3.16.0-0.rc4.el7.elrepo.x86_64 #1
[   42.699191] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   42.699194]  0000000000000000 000000005a85972e ffff8800d1fc3a60 ffffffff81652f31
[   42.699198]  ffff8800d1fc3aa8 ffff8800d1fc3a98 ffffffff81072cbd ffff8800d76b0000
[   42.699202]  0000000000071040 0000000000000010 00000000fffc12eb 00000000000000aa
[   42.699206] Call Trace:
[   42.699215]  [<ffffffff81652f31>] dump_stack+0x45/0x56
[   42.699225]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   42.699228]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   42.699243]  [<ffffffffa03692ce>] ? gen4_read32+0x4e/0xc0 [i915]
[   42.699258]  [<ffffffffa0378a49>] intel_wait_for_vblank+0x209/0x210 [i915]
[   42.699276]  [<ffffffffa03af510>] intel_tv_detect+0x220/0x570 [i915]
[   42.699284]  [<ffffffffa0237ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   42.699289]  [<ffffffffa0237be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   42.699305]  [<ffffffffa01fa72f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   42.699314]  [<ffffffffa01eba9c>] drm_ioctl+0x1ec/0x660 [drm]
[   42.699318]  [<ffffffff8121a428>] ? fsnotify+0x238/0x310
[   42.699322]  [<ffffffff811eef80>] do_vfs_ioctl+0x2e0/0x4a0
[   42.699325]  [<ffffffff81282526>] ? file_has_perm+0xa6/0xb0
[   42.699327]  [<ffffffff811ef1c1>] SyS_ioctl+0x81/0xa0
[   42.699330]  [<ffffffff8110e646>] ? __audit_syscall_exit+0x1f6/0x2a0
[   42.699333]  [<ffffffff8165b1a9>] system_call_fastpath+0x16/0x1b
[   42.699335] ---[ end trace f6b647fdfdd05290 ]---
[   42.807051] ------------[ cut here ]------------
[   42.807100] WARNING: CPU: 1 PID: 1133 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   42.807102] vblank wait timed out
[   42.807104] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq arc4 snd_seq_device iwldvm mac80211 coretemp iTCO_wdt snd_pcm snd_timer iTCO_vendor_support ppdev iwlwifi snd tg3 joydev dell_laptop dell_wmi sparse_keymap kvm_intel dcdbas kvm i915 soundcore sdhci_pci serio_raw cfg80211 i2c_algo_bit sdhci ptp rfkill parport_pc
[   42.807159]  pps_core mmc_core drm_kms_helper i2c_i801 drm lpc_ich pcspkr parport wmi shpchp i2c_core mfd_core acpi_cpufreq video xfs libcrc32c sd_mod crc_t10dif crct10dif_common sr_mod cdrom ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket
[   42.807187] CPU: 1 PID: 1133 Comm: X Tainted: G        W     3.16.0-0.rc4.el7.elrepo.x86_64 #1
[   42.807190] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   42.807192]  0000000000000000 000000005a85972e ffff8800d1fc3a60 ffffffff81652f31
[   42.807196]  ffff8800d1fc3aa8 ffff8800d1fc3a98 ffffffff81072cbd ffff8800d76b0000
[   42.807200]  0000000000071040 0000000000000014 00000000fffc1357 00000000000000aa
[   42.807205] Call Trace:
[   42.807213]  [<ffffffff81652f31>] dump_stack+0x45/0x56
[   42.807218]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   42.807227]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   42.807242]  [<ffffffffa03692ce>] ? gen4_read32+0x4e/0xc0 [i915]
[   42.807258]  [<ffffffffa0378a49>] intel_wait_for_vblank+0x209/0x210 [i915]
[   42.807275]  [<ffffffffa03af510>] intel_tv_detect+0x220/0x570 [i915]
[   42.807283]  [<ffffffffa0237ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   42.807288]  [<ffffffffa0237be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   42.807304]  [<ffffffffa01fa72f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   42.807312]  [<ffffffffa01eba9c>] drm_ioctl+0x1ec/0x660 [drm]
[   42.807317]  [<ffffffff811eef80>] do_vfs_ioctl+0x2e0/0x4a0
[   42.807320]  [<ffffffff81282526>] ? file_has_perm+0xa6/0xb0
[   42.807323]  [<ffffffff811dd6ee>] ? ____fput+0xe/0x10
[   42.807325]  [<ffffffff811ef1c1>] SyS_ioctl+0x81/0xa0
[   42.807329]  [<ffffffff8165b1a9>] system_call_fastpath+0x16/0x1b
[   42.807330] ---[ end trace f6b647fdfdd05291 ]---
Comment 3 Alan Bartlett 2014-07-14 14:45:05 UTC
Updated to linux-3.16-rc5

Call traces --

[    0.900052] ------------[ cut here ]------------
[    0.900098] WARNING: CPU: 1 PID: 113 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[    0.900101] vblank wait timed out
[    0.900102] Modules linked in: ahci(+) libahci firewire_ohci(+) libata firewire_core crc_itu_t yenta_socket i915(+) i2c_algo_bit drm_kms_helper drm i2c_core video
[    0.900118] CPU: 1 PID: 113 Comm: systemd-udevd Not tainted 3.16.0-0.rc5.el7.elrepo.x86_64 #1
[    0.900121] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[    0.900123]  0000000000000000 0000000065aca024 ffff8800d6f3b5e0 ffffffff81653351
[    0.900127]  ffff8800d6f3b628 ffff8800d6f3b618 ffffffff81072cbd ffff8800d6a00000
[    0.900131]  0000000000071040 0000000000000003 00000000fffb6fa4 00000000000000aa
[    0.900135] Call Trace:
[    0.900144]  [<ffffffff81653351>] dump_stack+0x45/0x56
[    0.900149]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[    0.900153]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[    0.900187]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[    0.900209]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[    0.900233]  [<ffffffffa0125730>] intel_tv_detect+0x220/0x570 [i915]
[    0.900239]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[    0.900244]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[    0.900248]  [<ffffffffa00929a0>] drm_fb_helper_probe_connector_modes.isra.3+0x50/0x70 [drm_kms_helper]
[    0.900253]  [<ffffffffa0093acd>] drm_fb_helper_initial_config+0x15d/0x4d0 [drm_kms_helper]
[    0.900274]  [<ffffffffa00df2c2>] ? gen4_write32+0x52/0xb0 [i915]
[    0.900294]  [<ffffffffa00ce0cd>] ? i915_hpd_irq_setup+0xcd/0xe0 [i915]
[    0.900316]  [<ffffffffa01059ff>] intel_fbdev_initial_config+0x1f/0x30 [i915]
[    0.900339]  [<ffffffffa01294fa>] i915_driver_load+0xf7a/0x1000 [i915]
[    0.900344]  [<ffffffff812fe978>] ? kobject_uevent_env+0x178/0x690
[    0.900347]  [<ffffffff8140cd87>] ? get_device+0x17/0x30
[    0.900350]  [<ffffffff81412865>] ? klist_class_dev_get+0x15/0x20
[    0.900353]  [<ffffffff8164177a>] ? klist_add_tail+0x3a/0x40
[    0.900356]  [<ffffffff8140e719>] ? device_add+0x219/0x630
[    0.900371]  [<ffffffffa00314d6>] ? drm_sysfs_device_add+0xd6/0x120 [drm]
[    0.900380]  [<ffffffffa002d9bd>] drm_dev_register+0xad/0x100 [drm]
[    0.900390]  [<ffffffffa003054f>] drm_get_pci_dev+0x8f/0x1f0 [drm]
[    0.900406]  [<ffffffffa009f4bb>] i915_pci_probe+0x3b/0x60 [i915]
[    0.900410]  [<ffffffff81335ed5>] local_pci_probe+0x45/0xa0
[    0.900413]  [<ffffffff81337085>] ? pci_match_device+0xe5/0x110
[    0.900416]  [<ffffffff813371e9>] pci_device_probe+0xf9/0x150
[    0.900419]  [<ffffffff81411990>] driver_probe_device+0x90/0x3c0
[    0.900421]  [<ffffffff81411d93>] __driver_attach+0x93/0xa0
[    0.900424]  [<ffffffff81411d00>] ? __device_attach+0x40/0x40
[    0.900427]  [<ffffffff8140f8d3>] bus_for_each_dev+0x73/0xc0
[    0.900429]  [<ffffffff8141142e>] driver_attach+0x1e/0x20
[    0.900432]  [<ffffffff81411010>] bus_add_driver+0x180/0x250
[    0.900434]  [<ffffffff81412574>] driver_register+0x64/0xf0
[    0.900437]  [<ffffffff8133586c>] __pci_register_driver+0x4c/0x50
[    0.900446]  [<ffffffffa00307ba>] drm_pci_init+0x10a/0x140 [drm]
[    0.900449]  [<ffffffffa017f000>] ? 0xffffffffa017efff
[    0.900464]  [<ffffffffa017f089>] i915_init+0x89/0x90 [i915]
[    0.900467]  [<ffffffff81002144>] do_one_initcall+0xd4/0x210
[    0.900471]  [<ffffffff811a3652>] ? __vunmap+0xb2/0x100
[    0.900474]  [<ffffffff810f1b58>] load_module+0x2018/0x2520
[    0.900477]  [<ffffffff810ed540>] ? store_uevent+0x70/0x70
[    0.900480]  [<ffffffff810ee119>] ? copy_module_from_fd.isra.47+0x129/0x180
[    0.900483]  [<ffffffff810f2216>] SyS_finit_module+0xa6/0xd0
[    0.900487]  [<ffffffff8165b5a9>] system_call_fastpath+0x16/0x1b
[    0.900489] ---[ end trace 60763e22e1bef478 ]---

[   45.717065] ------------[ cut here ]------------
[   45.717118] WARNING: CPU: 1 PID: 1155 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   45.717121] vblank wait timed out
[   45.717123] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm arc4 iwldvm mac80211 snd_timer snd soundcore iwlwifi coretemp cfg80211 tg3 joydev iTCO_wdt dell_laptop iTCO_vendor_support ppdev rfkill dell_wmi dcdbas kvm_intel kvm sparse_keymap sdhci_pci sdhci pcspkr serio_raw i2c_i801 mmc_core ptp
[   45.717177]  pps_core lpc_ich mfd_core shpchp parport_pc wmi acpi_cpufreq parport xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket i915 i2c_algo_bit drm_kms_helper drm i2c_core video
[   45.717202] CPU: 1 PID: 1155 Comm: X Tainted: G        W     3.16.0-0.rc5.el7.elrepo.x86_64 #1
[   45.717204] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   45.717206]  0000000000000000 000000008d2e1450 ffff8800d119fa60 ffffffff81653351
[   45.717211]  ffff8800d119faa8 ffff8800d119fa98 ffffffff81072cbd ffff8800d6a00000
[   45.717215]  0000000000071040 0000000000000007 00000000fffc1eb5 00000000000000aa
[   45.717219] Call Trace:
[   45.717228]  [<ffffffff81653351>] dump_stack+0x45/0x56
[   45.717239]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   45.717241]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   45.717258]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[   45.717274]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[   45.717292]  [<ffffffffa0125730>] intel_tv_detect+0x220/0x570 [i915]
[   45.717301]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   45.717306]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   45.717323]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   45.717326]  [<ffffffff811cf1a1>] ? __mem_cgroup_commit_charge+0x151/0x3c0
[   45.717335]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   45.717340]  [<ffffffff8121a548>] ? fsnotify+0x238/0x310
[   45.717343]  [<ffffffff811ef0a0>] do_vfs_ioctl+0x2e0/0x4a0
[   45.717346]  [<ffffffff812826f6>] ? file_has_perm+0xa6/0xb0
[   45.717349]  [<ffffffff811ef2e1>] SyS_ioctl+0x81/0xa0
[   45.717352]  [<ffffffff8165b5a9>] system_call_fastpath+0x16/0x1b
[   45.717354] ---[ end trace 60763e22e1bef479 ]---

[   45.825067] ------------[ cut here ]------------
[   45.825121] WARNING: CPU: 1 PID: 1155 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   45.825123] vblank wait timed out
[   45.825125] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm arc4 iwldvm mac80211 snd_timer snd soundcore iwlwifi coretemp cfg80211 tg3 joydev iTCO_wdt dell_laptop iTCO_vendor_support ppdev rfkill dell_wmi dcdbas kvm_intel kvm sparse_keymap sdhci_pci sdhci pcspkr serio_raw i2c_i801 mmc_core ptp
[   45.825178]  pps_core lpc_ich mfd_core shpchp parport_pc wmi acpi_cpufreq parport xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket i915 i2c_algo_bit drm_kms_helper drm i2c_core video
[   45.825203] CPU: 1 PID: 1155 Comm: X Tainted: G        W     3.16.0-0.rc5.el7.elrepo.x86_64 #1
[   45.825205] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   45.825207]  0000000000000000 000000008d2e1450 ffff8800d119fa60 ffffffff81653351
[   45.825212]  ffff8800d119faa8 ffff8800d119fa98 ffffffff81072cbd ffff8800d6a00000
[   45.825215]  0000000000071040 000000000000000b 00000000fffc1f21 00000000000000aa
[   45.825220] Call Trace:
[   45.825228]  [<ffffffff81653351>] dump_stack+0x45/0x56
[   45.825239]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   45.825242]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   45.825258]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[   45.825274]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[   45.825292]  [<ffffffffa0125730>] intel_tv_detect+0x220/0x570 [i915]
[   45.825301]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   45.825307]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   45.825323]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   45.825326]  [<ffffffff811cf1a1>] ? __mem_cgroup_commit_charge+0x151/0x3c0
[   45.825335]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   45.825340]  [<ffffffff811ef0a0>] do_vfs_ioctl+0x2e0/0x4a0
[   45.825343]  [<ffffffff812826f6>] ? file_has_perm+0xa6/0xb0
[   45.825346]  [<ffffffff811dd80e>] ? ____fput+0xe/0x10
[   45.825348]  [<ffffffff811ef2e1>] SyS_ioctl+0x81/0xa0
[   45.825351]  [<ffffffff8165b5a9>] system_call_fastpath+0x16/0x1b
[   45.825353] ---[ end trace 60763e22e1bef47a ]---

[   45.979038] ------------[ cut here ]------------
[   45.979081] WARNING: CPU: 1 PID: 1155 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   45.979083] vblank wait timed out
[   45.979084] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm arc4 iwldvm mac80211 snd_timer snd soundcore iwlwifi coretemp cfg80211 tg3 joydev iTCO_wdt dell_laptop iTCO_vendor_support ppdev rfkill dell_wmi dcdbas kvm_intel kvm sparse_keymap sdhci_pci sdhci pcspkr serio_raw i2c_i801 mmc_core ptp
[   45.979119]  pps_core lpc_ich mfd_core shpchp parport_pc wmi acpi_cpufreq parport xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket i915 i2c_algo_bit drm_kms_helper drm i2c_core video
[   45.979135] CPU: 1 PID: 1155 Comm: X Tainted: G        W     3.16.0-0.rc5.el7.elrepo.x86_64 #1
[   45.979136] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   45.979138]  0000000000000000 000000008d2e1450 ffff8800d119fa60 ffffffff81653351
[   45.979141]  ffff8800d119faa8 ffff8800d119fa98 ffffffff81072cbd ffff8800d6a00000
[   45.979143]  0000000000071040 000000000000000f 00000000fffc1fbb 00000000000000aa
[   45.979146] Call Trace:
[   45.979152]  [<ffffffff81653351>] dump_stack+0x45/0x56
[   45.979156]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   45.979159]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   45.979176]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[   45.979193]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[   45.979212]  [<ffffffffa0125730>] intel_tv_detect+0x220/0x570 [i915]
[   45.979221]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   45.979227]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   45.979244]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   45.979254]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   45.979259]  [<ffffffff8121a548>] ? fsnotify+0x238/0x310
[   45.979262]  [<ffffffff811ef0a0>] do_vfs_ioctl+0x2e0/0x4a0
[   45.979265]  [<ffffffff812826f6>] ? file_has_perm+0xa6/0xb0
[   45.979268]  [<ffffffff811ef2e1>] SyS_ioctl+0x81/0xa0
[   45.979271]  [<ffffffff8110e766>] ? __audit_syscall_exit+0x1f6/0x2a0
[   45.979274]  [<ffffffff8165b5a9>] system_call_fastpath+0x16/0x1b
[   45.979276] ---[ end trace 60763e22e1bef47b ]---

[   46.087064] ------------[ cut here ]------------
[   46.087118] WARNING: CPU: 1 PID: 1155 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   46.087120] vblank wait timed out
[   46.087122] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm arc4 iwldvm mac80211 snd_timer snd soundcore iwlwifi coretemp cfg80211 tg3 joydev iTCO_wdt dell_laptop iTCO_vendor_support ppdev rfkill dell_wmi dcdbas kvm_intel kvm sparse_keymap sdhci_pci sdhci pcspkr serio_raw i2c_i801 mmc_core ptp
[   46.087176]  pps_core lpc_ich mfd_core shpchp parport_pc wmi acpi_cpufreq parport xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket i915 i2c_algo_bit drm_kms_helper drm i2c_core video
[   46.087200] CPU: 1 PID: 1155 Comm: X Tainted: G        W     3.16.0-0.rc5.el7.elrepo.x86_64 #1
[   46.087202] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   46.087205]  0000000000000000 000000008d2e1450 ffff8800d119fa60 ffffffff81653351
[   46.087209]  ffff8800d119faa8 ffff8800d119fa98 ffffffff81072cbd ffff8800d6a00000
[   46.087213]  0000000000071040 0000000000000013 00000000fffc2027 00000000000000aa
[   46.087217] Call Trace:
[   46.087226]  [<ffffffff81653351>] dump_stack+0x45/0x56
[   46.087237]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   46.087239]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   46.087256]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[   46.087272]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[   46.087290]  [<ffffffffa0125730>] intel_tv_detect+0x220/0x570 [i915]
[   46.087299]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   46.087304]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   46.087320]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   46.087329]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   46.087334]  [<ffffffff811ef0a0>] do_vfs_ioctl+0x2e0/0x4a0
[   46.087337]  [<ffffffff812826f6>] ? file_has_perm+0xa6/0xb0
[   46.087340]  [<ffffffff811dd80e>] ? ____fput+0xe/0x10
[   46.087342]  [<ffffffff811ef2e1>] SyS_ioctl+0x81/0xa0
[   46.087346]  [<ffffffff8165b5a9>] system_call_fastpath+0x16/0x1b
[   46.087347] ---[ end trace 60763e22e1bef47c ]---
Comment 4 Alan Bartlett 2014-07-21 21:29:36 UTC
Updated to linux-3.16-rc6

Call traces --

[    0.910041] ------------[ cut here ]------------
[    0.910087] WARNING: CPU: 0 PID: 113 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[    0.910089] vblank wait timed out
[    0.910091] Modules linked in: ahci(+) libahci firewire_ohci(+) libata firewire_core crc_itu_t yenta_socket i915(+) i2c_algo_bit drm_kms_helper drm i2c_core video
[    0.910107] CPU: 0 PID: 113 Comm: systemd-udevd Not tainted 3.16.0-0.rc6.el7.elrepo.x86_64 #1
[    0.910109] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[    0.910112]  0000000000000000 00000000a792e3e6 ffff8800378235e0 ffffffff8165354c
[    0.910116]  ffff880037823628 ffff880037823618 ffffffff81072cbd ffff880037a70000
[    0.910120]  0000000000071040 0000000000000003 00000000fffb6fad 00000000000000aa
[    0.910124] Call Trace:
[    0.910132]  [<ffffffff8165354c>] dump_stack+0x45/0x56
[    0.910137]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[    0.910141]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[    0.910175]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[    0.910197]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[    0.910221]  [<ffffffffa0125760>] intel_tv_detect+0x220/0x570 [i915]
[    0.910227]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[    0.910231]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[    0.910236]  [<ffffffffa00929a0>] drm_fb_helper_probe_connector_modes.isra.3+0x50/0x70 [drm_kms_helper]
[    0.910240]  [<ffffffffa0093acd>] drm_fb_helper_initial_config+0x15d/0x4d0 [drm_kms_helper]
[    0.910261]  [<ffffffffa00df2c2>] ? gen4_write32+0x52/0xb0 [i915]
[    0.910281]  [<ffffffffa00ce0cd>] ? i915_hpd_irq_setup+0xcd/0xe0 [i915]
[    0.910304]  [<ffffffffa01059ff>] intel_fbdev_initial_config+0x1f/0x30 [i915]
[    0.910327]  [<ffffffffa012952a>] i915_driver_load+0xf7a/0x1000 [i915]
[    0.910331]  [<ffffffff812feb28>] ? kobject_uevent_env+0x178/0x690
[    0.910335]  [<ffffffff8140cff7>] ? get_device+0x17/0x30
[    0.910338]  [<ffffffff81412ad5>] ? klist_class_dev_get+0x15/0x20
[    0.910341]  [<ffffffff816419aa>] ? klist_add_tail+0x3a/0x40
[    0.910343]  [<ffffffff8140e989>] ? device_add+0x219/0x630
[    0.910358]  [<ffffffffa00314d6>] ? drm_sysfs_device_add+0xd6/0x120 [drm]
[    0.910367]  [<ffffffffa002d9bd>] drm_dev_register+0xad/0x100 [drm]
[    0.910377]  [<ffffffffa003054f>] drm_get_pci_dev+0x8f/0x1f0 [drm]
[    0.910393]  [<ffffffffa009f4bb>] i915_pci_probe+0x3b/0x60 [i915]
[    0.910397]  [<ffffffff81336085>] local_pci_probe+0x45/0xa0
[    0.910400]  [<ffffffff81337235>] ? pci_match_device+0xe5/0x110
[    0.910402]  [<ffffffff81337399>] pci_device_probe+0xf9/0x150
[    0.910406]  [<ffffffff81411c00>] driver_probe_device+0x90/0x3c0
[    0.910408]  [<ffffffff81412003>] __driver_attach+0x93/0xa0
[    0.910411]  [<ffffffff81411f70>] ? __device_attach+0x40/0x40
[    0.910413]  [<ffffffff8140fb43>] bus_for_each_dev+0x73/0xc0
[    0.910416]  [<ffffffff8141169e>] driver_attach+0x1e/0x20
[    0.910418]  [<ffffffff81411280>] bus_add_driver+0x180/0x250
[    0.910421]  [<ffffffff814127e4>] driver_register+0x64/0xf0
[    0.910424]  [<ffffffff81335a1c>] __pci_register_driver+0x4c/0x50
[    0.910433]  [<ffffffffa00307ba>] drm_pci_init+0x10a/0x140 [drm]
[    0.910435]  [<ffffffffa017f000>] ? 0xffffffffa017efff
[    0.910451]  [<ffffffffa017f089>] i915_init+0x89/0x90 [i915]
[    0.910454]  [<ffffffff81002144>] do_one_initcall+0xd4/0x210
[    0.910457]  [<ffffffff811a3892>] ? __vunmap+0xb2/0x100
[    0.910461]  [<ffffffff810f1cf8>] load_module+0x2018/0x2520
[    0.910464]  [<ffffffff810ed6e0>] ? store_uevent+0x70/0x70
[    0.910467]  [<ffffffff810ee2b9>] ? copy_module_from_fd.isra.47+0x129/0x180
[    0.910469]  [<ffffffff810f23b6>] SyS_finit_module+0xa6/0xd0
[    0.910473]  [<ffffffff8165b769>] system_call_fastpath+0x16/0x1b
[    0.910475] ---[ end trace 0ceebdeab8c78d0a ]---

[   79.331057] ------------[ cut here ]------------
[   79.331110] WARNING: CPU: 0 PID: 1157 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   79.331112] vblank wait timed out
[   79.331114] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller arc4 snd_hda_codec snd_hwdep snd_seq iwldvm snd_seq_device mac80211 snd_pcm coretemp iwlwifi ppdev kvm_intel iTCO_wdt iTCO_vendor_support cfg80211 joydev dell_laptop rfkill i2c_i801 serio_raw kvm dcdbas sdhci_pci sdhci tg3 dell_wmi sparse_keymap mmc_core ptp pcspkr parport_pc pps_core parport
[   79.331167]  shpchp snd_timer snd acpi_cpufreq lpc_ich wmi soundcore mfd_core xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket i915 i2c_algo_bit drm_kms_helper drm i2c_core video
[   79.331193] CPU: 0 PID: 1157 Comm: X Tainted: G        W     3.16.0-0.rc6.el7.elrepo.x86_64 #1
[   79.331195] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   79.331197]  0000000000000000 0000000068eb4a31 ffff8800d75bfa60 ffffffff8165354c
[   79.331202]  ffff8800d75bfaa8 ffff8800d75bfa98 ffffffff81072cbd ffff880037a70000
[   79.331205]  0000000000071040 0000000000000007 00000000fffca202 00000000000000aa
[   79.331210] Call Trace:
[   79.331218]  [<ffffffff8165354c>] dump_stack+0x45/0x56
[   79.331223]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   79.331231]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   79.331248]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[   79.331264]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[   79.331282]  [<ffffffffa0125760>] intel_tv_detect+0x220/0x570 [i915]
[   79.331291]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   79.331296]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   79.331312]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   79.331316]  [<ffffffff811cf3e1>] ? __mem_cgroup_commit_charge+0x151/0x3c0
[   79.331325]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   79.331330]  [<ffffffff8121a788>] ? fsnotify+0x238/0x310
[   79.331333]  [<ffffffff811ef2e0>] do_vfs_ioctl+0x2e0/0x4a0
[   79.331336]  [<ffffffff81282896>] ? file_has_perm+0xa6/0xb0
[   79.331338]  [<ffffffff811ef521>] SyS_ioctl+0x81/0xa0
[   79.331342]  [<ffffffff8165b769>] system_call_fastpath+0x16/0x1b
[   79.331343] ---[ end trace 0ceebdeab8c78d0b ]---

[   79.439054] ------------[ cut here ]------------
[   79.439108] WARNING: CPU: 1 PID: 1157 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   79.439111] vblank wait timed out
[   79.439112] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller arc4 snd_hda_codec snd_hwdep snd_seq iwldvm snd_seq_device mac80211 snd_pcm coretemp iwlwifi ppdev kvm_intel iTCO_wdt iTCO_vendor_support cfg80211 joydev dell_laptop rfkill i2c_i801 serio_raw kvm dcdbas sdhci_pci sdhci tg3 dell_wmi sparse_keymap mmc_core ptp pcspkr parport_pc pps_core parport
[   79.439165]  shpchp snd_timer snd acpi_cpufreq lpc_ich wmi soundcore mfd_core xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket i915 i2c_algo_bit drm_kms_helper drm i2c_core video
[   79.439191] CPU: 1 PID: 1157 Comm: X Tainted: G        W     3.16.0-0.rc6.el7.elrepo.x86_64 #1
[   79.439194] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   79.439196]  0000000000000000 0000000068eb4a31 ffff8800d75bfa60 ffffffff8165354c
[   79.439200]  ffff8800d75bfaa8 ffff8800d75bfa98 ffffffff81072cbd ffff880037a70000
[   79.439204]  0000000000071040 000000000000000b 00000000fffca26e 00000000000000aa
[   79.439208] Call Trace:
[   79.439217]  [<ffffffff8165354c>] dump_stack+0x45/0x56
[   79.439228]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   79.439230]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   79.439246]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[   79.439262]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[   79.439280]  [<ffffffffa0125760>] intel_tv_detect+0x220/0x570 [i915]
[   79.439289]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   79.439295]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   79.439311]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   79.439314]  [<ffffffff811cf3e1>] ? __mem_cgroup_commit_charge+0x151/0x3c0
[   79.439323]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   79.439328]  [<ffffffff811ef2e0>] do_vfs_ioctl+0x2e0/0x4a0
[   79.439331]  [<ffffffff81282896>] ? file_has_perm+0xa6/0xb0
[   79.439334]  [<ffffffff811dda4e>] ? ____fput+0xe/0x10
[   79.439336]  [<ffffffff811ef521>] SyS_ioctl+0x81/0xa0
[   79.439339]  [<ffffffff8165b769>] system_call_fastpath+0x16/0x1b
[   79.439341] ---[ end trace 0ceebdeab8c78d0c ]---

[   79.593052] ------------[ cut here ]------------
[   79.593107] WARNING: CPU: 0 PID: 1157 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   79.593109] vblank wait timed out
[   79.593111] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller arc4 snd_hda_codec snd_hwdep snd_seq iwldvm snd_seq_device mac80211 snd_pcm coretemp iwlwifi ppdev kvm_intel iTCO_wdt iTCO_vendor_support cfg80211 joydev dell_laptop rfkill i2c_i801 serio_raw kvm dcdbas sdhci_pci sdhci tg3 dell_wmi sparse_keymap mmc_core ptp pcspkr parport_pc pps_core parport
[   79.593164]  shpchp snd_timer snd acpi_cpufreq lpc_ich wmi soundcore mfd_core xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket i915 i2c_algo_bit drm_kms_helper drm i2c_core video
[   79.593189] CPU: 0 PID: 1157 Comm: X Tainted: G        W     3.16.0-0.rc6.el7.elrepo.x86_64 #1
[   79.593191] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   79.593194]  0000000000000000 0000000068eb4a31 ffff8800d75bfa60 ffffffff8165354c
[   79.593198]  ffff8800d75bfaa8 ffff8800d75bfa98 ffffffff81072cbd ffff880037a70000
[   79.593202]  0000000000071040 000000000000000f 00000000fffca308 00000000000000aa
[   79.593206] Call Trace:
[   79.593214]  [<ffffffff8165354c>] dump_stack+0x45/0x56
[   79.593220]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   79.593228]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   79.593245]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[   79.593261]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[   79.593279]  [<ffffffffa0125760>] intel_tv_detect+0x220/0x570 [i915]
[   79.593287]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   79.593293]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   79.593309]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   79.593319]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   79.593324]  [<ffffffff8121a788>] ? fsnotify+0x238/0x310
[   79.593327]  [<ffffffff811ef2e0>] do_vfs_ioctl+0x2e0/0x4a0
[   79.593330]  [<ffffffff81282896>] ? file_has_perm+0xa6/0xb0
[   79.593332]  [<ffffffff811ef521>] SyS_ioctl+0x81/0xa0
[   79.593336]  [<ffffffff8110e906>] ? __audit_syscall_exit+0x1f6/0x2a0
[   79.593339]  [<ffffffff8165b769>] system_call_fastpath+0x16/0x1b
[   79.593341] ---[ end trace 0ceebdeab8c78d0d ]---

[   79.701051] ------------[ cut here ]------------
[   79.701104] WARNING: CPU: 0 PID: 1157 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   79.701107] vblank wait timed out
[   79.701109] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller arc4 snd_hda_codec snd_hwdep snd_seq iwldvm snd_seq_device mac80211 snd_pcm coretemp iwlwifi ppdev kvm_intel iTCO_wdt iTCO_vendor_support cfg80211 joydev dell_laptop rfkill i2c_i801 serio_raw kvm dcdbas sdhci_pci sdhci tg3 dell_wmi sparse_keymap mmc_core ptp pcspkr parport_pc pps_core parport
[   79.701162]  shpchp snd_timer snd acpi_cpufreq lpc_ich wmi soundcore mfd_core xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci libahci firewire_ohci libata firewire_core crc_itu_t yenta_socket i915 i2c_algo_bit drm_kms_helper drm i2c_core video
[   79.701187] CPU: 0 PID: 1157 Comm: X Tainted: G        W     3.16.0-0.rc6.el7.elrepo.x86_64 #1
[   79.701189] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   79.701191]  0000000000000000 0000000068eb4a31 ffff8800d75bfa60 ffffffff8165354c
[   79.701196]  ffff8800d75bfaa8 ffff8800d75bfa98 ffffffff81072cbd ffff880037a70000
[   79.701199]  0000000000071040 0000000000000013 00000000fffca374 00000000000000aa
[   79.701204] Call Trace:
[   79.701212]  [<ffffffff8165354c>] dump_stack+0x45/0x56
[   79.701217]  [<ffffffff81072cbd>] warn_slowpath_common+0x7d/0xa0
[   79.701221]  [<ffffffff81072d3c>] warn_slowpath_fmt+0x5c/0x80
[   79.701244]  [<ffffffffa00df41e>] ? gen4_read32+0x4e/0xc0 [i915]
[   79.701260]  [<ffffffffa00eebc9>] intel_wait_for_vblank+0x209/0x210 [i915]
[   79.701278]  [<ffffffffa0125760>] intel_tv_detect+0x220/0x570 [i915]
[   79.701287]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   79.701292]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   79.701309]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   79.701318]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   79.701323]  [<ffffffff811ef2e0>] do_vfs_ioctl+0x2e0/0x4a0
[   79.701326]  [<ffffffff81282896>] ? file_has_perm+0xa6/0xb0
[   79.701329]  [<ffffffff811dda4e>] ? ____fput+0xe/0x10
[   79.701331]  [<ffffffff811ef521>] SyS_ioctl+0x81/0xa0
[   79.701334]  [<ffffffff8165b769>] system_call_fastpath+0x16/0x1b
[   79.701336] ---[ end trace 0ceebdeab8c78d0e ]---
Comment 5 Alan Bartlett 2014-07-28 14:39:03 UTC
Updated to linux-3.16.rc7 --

------------[ cut here ]------------
WARNING: CPU: 0 PID: 80 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: i915(+) drm_kms_helper video
CPU: 0 PID: 80 Comm: modprobe Not tainted 3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff880037c7b6b8 ffffffff816467a9 000000000000035d
 ffff880037c7b708 ffff880037c7b6f8 ffffffff810714bc 00000000fffb6f2c
 ffff880037c90000 0000000000071040 0000000000000003 00000000fffb6f2b
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffffa0012922>] drm_fb_helper_initial_config+0x192/0x240 [drm_kms_helper]
 [<ffffffffa008cd1f>] intel_fbdev_initial_config+0x1f/0x30 [i915]
 [<ffffffffa00afe63>] i915_load_modeset_init+0x1c3/0x200 [i915]
 [<ffffffffa00b20f0>] i915_driver_load+0x590/0x730 [i915]
 [<ffffffff813fee0d>] drm_dev_register+0xbd/0x110
 [<ffffffff814012cb>] drm_get_pci_dev+0x9b/0x200
 [<ffffffffa00236e3>] i915_pci_probe+0x43/0x60 [i915]
 [<ffffffff8131e42c>] local_pci_probe+0x4c/0xb0
 [<ffffffff8131e519>] pci_call_probe+0x89/0xb0
 [<ffffffff8131e36e>] ? pci_match_device+0xde/0x110
 [<ffffffff8131e7f9>] pci_device_probe+0x79/0xa0
 [<ffffffff8141eab2>] ? driver_sysfs_add+0x82/0xb0
 [<ffffffff8141ebfa>] really_probe+0x7a/0x250
 [<ffffffff8141ee0e>] driver_probe_device+0x3e/0x60
 [<ffffffff8141eedb>] __driver_attach+0xab/0xb0
 [<ffffffff8141ee30>] ? driver_probe_device+0x60/0x60
 [<ffffffff8141ee30>] ? driver_probe_device+0x60/0x60
 [<ffffffff8141d134>] bus_for_each_dev+0x94/0xb0
 [<ffffffff8141ea2e>] driver_attach+0x1e/0x20
 [<ffffffff8141e4d0>] bus_add_driver+0x1a0/0x220
 [<ffffffff8141f694>] driver_register+0x64/0xf0
 [<ffffffffa0107000>] ? 0xffffffffa0106fff
 [<ffffffff8131e90c>] __pci_register_driver+0x4c/0x50
 [<ffffffff81401535>] drm_pci_init+0x105/0x130
 [<ffffffffa0107000>] ? 0xffffffffa0106fff
 [<ffffffffa0107088>] i915_init+0x88/0x8a [i915]
 [<ffffffff81002099>] do_one_initcall+0x99/0x1e0
 [<ffffffff810ecbb0>] do_init_module+0x30/0x1a0
 [<ffffffff810eeb54>] load_module+0x3e4/0x5d0
 [<ffffffff810ec4a0>] ? mod_sysfs_teardown+0x150/0x150
 [<ffffffff812e83bc>] ? copy_user_generic_string+0x2c/0x40
 [<ffffffff810ebac0>] ? module_sect_show+0x30/0x30
 [<ffffffff810eee83>] SyS_init_module+0x93/0xa0
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c00 ]---

------------[ cut here ]------------
WARNING: CPU: 0 PID: 111 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: i915 drm_kms_helper video
CPU: 0 PID: 111 Comm: plymouthd Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff880037d3f9d8 ffffffff816467a9 000000000000035d
 ffff880037d3fa28 ffff880037d3fa18 ffffffff810714bc 00000000fffb7372
 ffff880037c90000 0000000000071040 0000000000000007 00000000fffb7371
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff811bad3f>] ? do_huge_pmd_anonymous_page+0x11f/0x2d0
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff8105d214>] ? __do_page_fault+0xe4/0x4c0
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c01 ]---

------------[ cut here ]------------
WARNING: CPU: 0 PID: 111 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: i915 drm_kms_helper video
CPU: 0 PID: 111 Comm: plymouthd Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff880037d3f9d8 ffffffff816467a9 000000000000035d
 ffff880037d3fa28 ffff880037d3fa18 ffffffff810714bc 00000000fffb73de
 ffff880037c90000 0000000000071040 000000000000000b 00000000fffb73dd
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c02 ]---

------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffbddb0
 ffff880037c90000 0000000000071040 000000000000000f 00000000fffbddaf
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff8115ad5f>] ? __generic_file_write_iter+0x18f/0x390
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c03 ]---

------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffbde33
 ffff880037c90000 0000000000071040 0000000000000014 00000000fffbde32
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c04 ]---


------------[ cut here ]------------
WARNING: CPU: 1 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 1 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffbdee8
 ffff880037c90000 0000000000071040 0000000000000019 00000000fffbdee7
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c05 ]---

------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffbdf6b
 ffff880037c90000 0000000000071040 000000000000001e 00000000fffbdf6a
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c06 ]---

------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffbe67e
 ffff880037c90000 0000000000071040 0000000000000023 00000000fffbe67d
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c07 ]---

------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffbe702
 ffff880037c90000 0000000000071040 0000000000000028 00000000fffbe701
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff8101f2c2>] ? fpu_finit+0x22/0x40
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164b207>] ? int_check_syscall_exit_work+0x34/0x3d
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c08 ]---


------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffc0d89
 ffff880037c90000 0000000000071040 000000000000002d 00000000fffc0d88
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff8101f2c2>] ? fpu_finit+0x22/0x40
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164b207>] ? int_check_syscall_exit_work+0x34/0x3d
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c09 ]---

------------[ cut here ]------------
WARNING: CPU: 1 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 1 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffc0df9
 ffff880037c90000 0000000000071040 0000000000000031 00000000fffc0df8
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff8101f2c2>] ? fpu_finit+0x22/0x40
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164b207>] ? int_check_syscall_exit_work+0x34/0x3d
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c0a ]---


------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffc0ead
 ffff880037c90000 0000000000071040 0000000000000036 00000000fffc0eac
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff8101f2c2>] ? fpu_finit+0x22/0x40
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164b207>] ? int_check_syscall_exit_work+0x34/0x3d
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c0b ]---

------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffc0f5a
 ffff880037c90000 0000000000071040 000000000000003b 00000000fffc0f59
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff8101f2c2>] ? fpu_finit+0x22/0x40
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164b207>] ? int_check_syscall_exit_work+0x34/0x3d
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c0c ]---


------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffc101c
 ffff880037c90000 0000000000071040 0000000000000040 00000000fffc101b
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff8101f2c2>] ? fpu_finit+0x22/0x40
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164b207>] ? int_check_syscall_exit_work+0x34/0x3d
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c0d ]---

------------[ cut here ]------------
WARNING: CPU: 0 PID: 1275 at drivers/gpu/drm/i915/intel_display.c:861 g4x_wait_for_vblank+0xd5/0xf0 [i915]()
vblank wait timed out
Modules linked in: ipv6 8021q garp stp llc cpufreq_ondemand ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables dm_mod ppdev dell_wmi sparse_keymap gpio_ich iTCO_wdt iTCO_vendor_support dell_laptop dcdbas microcode joydev pcspkr i2c_i801 parport_pc parport wmi sg lpc_ich snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic acpi_cpufreq snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore tg3 ptp pps_core arc4 hwmon iwldvm mac80211 iwlwifi cfg80211 rfkill ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif crct10dif_common sdhci_pci sdhci mmc_core firewire_ohci firewire_core crc_itu_t yenta_socket ahci libahci i915 drm_kms_helper video
CPU: 0 PID: 1275 Comm: Xorg Tainted: G        W     3.16.0-0.rc7.el6.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
 000000000000035d ffff8800d84739d8 ffffffff816467a9 000000000000035d
 ffff8800d8473a28 ffff8800d8473a18 ffffffff810714bc 00000000fffc10a3
 ffff880037c90000 0000000000071040 0000000000000045 00000000fffc10a2
Call Trace:
 [<ffffffff816467a9>] dump_stack+0x49/0x60
 [<ffffffff810714bc>] warn_slowpath_common+0x8c/0xc0
 [<ffffffff810715a6>] warn_slowpath_fmt+0x46/0x50
 [<ffffffffa0078675>] g4x_wait_for_vblank+0xd5/0xf0 [i915]
 [<ffffffffa00786c5>] intel_wait_for_vblank+0x35/0x130 [i915]
 [<ffffffffa00adb5b>] intel_tv_detect_type+0x10b/0x330 [i915]
 [<ffffffffa00ade55>] intel_tv_detect+0xd5/0x1c0 [i915]
 [<ffffffffa000fc1b>] drm_helper_probe_single_connector_modes_merge_bits+0x1bb/0x380 [drm_kms_helper]
 [<ffffffff81404814>] ? _object_find+0x74/0xb0
 [<ffffffffa000fe13>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
 [<ffffffff8140702c>] drm_mode_getconnector+0x40c/0x450
 [<ffffffff813f8dae>] drm_ioctl+0x2de/0x650
 [<ffffffff8101f2c2>] ? fpu_finit+0x22/0x40
 [<ffffffff81406c20>] ? drm_plane_force_disable+0x70/0x70
 [<ffffffff811e0133>] do_vfs_ioctl+0x73/0x380
 [<ffffffff8126beaf>] ? selinux_file_ioctl+0x4f/0xf0
 [<ffffffff811e04e1>] SyS_ioctl+0xa1/0xb0
 [<ffffffff8164b207>] ? int_check_syscall_exit_work+0x34/0x3d
 [<ffffffff8164af69>] system_call_fastpath+0x16/0x1b
---[ end trace 2797be4ce71a0c0e ]---

Bug(s) still present. 

As this problem is not present in the 3.15.X series, if it still exists when Linus releases 3.16 then I will have to re-categorise this problem as a regression.
Comment 6 Alan Bartlett 2014-07-28 14:42:52 UTC
Created attachment 144431 [details]
dmesg output, 3.16-rc7
Comment 7 Alan Bartlett 2014-08-04 16:17:07 UTC
Created attachment 145121 [details]
dmesg output, linux-3.17
Comment 8 Alan Bartlett 2014-08-04 16:20:32 UTC
Created attachment 145131 [details]
dmesg output, linux-3.16
Comment 9 Alan Bartlett 2014-08-04 16:25:25 UTC
I am recategorising this as a regression.

Not present in the 3.15.X branch.

Observed in 3.16-rc3 to 3.16-rc7 candidates.

Present in 3.16

Trace --

[    0.880041] ------------[ cut here ]------------
[    0.880088] WARNING: CPU: 0 PID: 113 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[    0.880091] vblank wait timed out
[    0.880093] Modules linked in: firewire_ohci(+) ahci(+) libahci libata firewire_core crc_itu_t yenta_socket i915(+) i2c_algo_bit drm_kms_helper drm i2c_core video
[    0.880108] CPU: 0 PID: 113 Comm: systemd-udevd Not tainted 3.16.0-1.el7.elrepo.x86_64 #1
[    0.880111] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[    0.880113]  0000000000000000 00000000fed30d5f ffff8800d6f175e0 ffffffff8165a818
[    0.880118]  ffff8800d6f17628 ffff8800d6f17618 ffffffff81072cad ffff880037ae0000
[    0.880121]  0000000000071040 0000000000000003 00000000fffb6f90 00000000000000aa
[    0.880126] Call Trace:
[    0.880134]  [<ffffffff8165a818>] dump_stack+0x45/0x56
[    0.880139]  [<ffffffff81072cad>] warn_slowpath_common+0x7d/0xa0
[    0.880142]  [<ffffffff81072d2c>] warn_slowpath_fmt+0x5c/0x80
[    0.880177]  [<ffffffffa00df3ae>] ? gen4_read32+0x4e/0xc0 [i915]
[    0.880200]  [<ffffffffa00eeb59>] intel_wait_for_vblank+0x209/0x210 [i915]
[    0.880225]  [<ffffffffa01256f0>] intel_tv_detect+0x220/0x570 [i915]
[    0.880232]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[    0.880236]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[    0.880241]  [<ffffffffa00929a0>] drm_fb_helper_probe_connector_modes.isra.3+0x50/0x70 [drm_kms_helper]
[    0.880245]  [<ffffffffa0093acd>] drm_fb_helper_initial_config+0x15d/0x4d0 [drm_kms_helper]
[    0.880268]  [<ffffffffa00df252>] ? gen4_write32+0x52/0xb0 [i915]
[    0.880290]  [<ffffffffa00ce06d>] ? i915_hpd_irq_setup+0xcd/0xe0 [i915]
[    0.880313]  [<ffffffffa010598f>] intel_fbdev_initial_config+0x1f/0x30 [i915]
[    0.880337]  [<ffffffffa01294ba>] i915_driver_load+0xf7a/0x1000 [i915]
[    0.880341]  [<ffffffff812fee08>] ? kobject_uevent_env+0x178/0x690
[    0.880345]  [<ffffffff81414027>] ? get_device+0x17/0x30
[    0.880348]  [<ffffffff81419b05>] ? klist_class_dev_get+0x15/0x20
[    0.880352]  [<ffffffff81648bda>] ? klist_add_tail+0x3a/0x40
[    0.880354]  [<ffffffff814159b9>] ? device_add+0x219/0x630
[    0.880370]  [<ffffffffa00314d6>] ? drm_sysfs_device_add+0xd6/0x120 [drm]
[    0.880380]  [<ffffffffa002d9bd>] drm_dev_register+0xad/0x100 [drm]
[    0.880391]  [<ffffffffa003054f>] drm_get_pci_dev+0x8f/0x1f0 [drm]
[    0.880410]  [<ffffffffa009f4bb>] i915_pci_probe+0x3b/0x60 [i915]
[    0.880414]  [<ffffffff81336365>] local_pci_probe+0x45/0xa0
[    0.880416]  [<ffffffff81337515>] ? pci_match_device+0xe5/0x110
[    0.880419]  [<ffffffff81337679>] pci_device_probe+0xf9/0x150
[    0.880422]  [<ffffffff81418c30>] driver_probe_device+0x90/0x3c0
[    0.880424]  [<ffffffff81419033>] __driver_attach+0x93/0xa0
[    0.880427]  [<ffffffff81418fa0>] ? __device_attach+0x40/0x40
[    0.880429]  [<ffffffff81416b73>] bus_for_each_dev+0x73/0xc0
[    0.880432]  [<ffffffff814186ce>] driver_attach+0x1e/0x20
[    0.880434]  [<ffffffff814182b0>] bus_add_driver+0x180/0x250
[    0.880436]  [<ffffffff81419814>] driver_register+0x64/0xf0
[    0.880440]  [<ffffffff81335cfc>] __pci_register_driver+0x4c/0x50
[    0.880450]  [<ffffffffa00307ba>] drm_pci_init+0x10a/0x140 [drm]
[    0.880452]  [<ffffffffa017f000>] ? 0xffffffffa017efff
[    0.880468]  [<ffffffffa017f089>] i915_init+0x89/0x90 [i915]
[    0.880472]  [<ffffffff81002144>] do_one_initcall+0xd4/0x210
[    0.880475]  [<ffffffff811a3972>] ? __vunmap+0xb2/0x100
[    0.880479]  [<ffffffff810f1ce8>] load_module+0x2018/0x2520
[    0.880482]  [<ffffffff810ed6d0>] ? store_uevent+0x70/0x70
[    0.880485]  [<ffffffff810ee2a9>] ? copy_module_from_fd.isra.47+0x129/0x180
[    0.880488]  [<ffffffff810f23a6>] SyS_finit_module+0xa6/0xd0
[    0.880491]  [<ffffffff81662ae9>] system_call_fastpath+0x16/0x1b
[    0.880493] ---[ end trace eacf7ec0f3643c84 ]---
Comment 10 Alan Bartlett 2014-08-07 16:21:41 UTC
Created attachment 145501 [details]
dmesg, after booting with drm.debug=0xe passed to kernel
Comment 11 Alan Bartlett 2014-08-15 12:32:02 UTC
Created attachment 146711 [details]
dmesg; drm.debug=0xe passed to kernel at boot
Comment 12 Alan Bartlett 2014-08-15 12:34:35 UTC
Updated to linux-3.16.1

Traces --

[    1.053163] ------------[ cut here ]------------
[    1.053210] WARNING: CPU: 0 PID: 111 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[    1.053212] vblank wait timed out
[    1.053214] Modules linked in: ahci firewire_ohci(+) libahci i915(+) libata firewire_core crc_itu_t yenta_socket i2c_algo_bit drm_kms_helper drm i2c_core video
[    1.053230] CPU: 0 PID: 111 Comm: systemd-udevd Not tainted 3.16.1-1.el7.elrepo.x86_64 #1
[    1.053233] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[    1.053235]  0000000000000000 00000000a522a433 ffff8800d6fbf5e0 ffffffff81659d38
[    1.053239]  ffff8800d6fbf628 ffff8800d6fbf618 ffffffff81072cad ffff880037a70000
[    1.053243]  0000000000071040 0000000000000003 00000000fffb703c 00000000000000aa
[    1.053248] Call Trace:
[    1.053255]  [<ffffffff81659d38>] dump_stack+0x45/0x56
[    1.053260]  [<ffffffff81072cad>] warn_slowpath_common+0x7d/0xa0
[    1.053263]  [<ffffffff81072d2c>] warn_slowpath_fmt+0x5c/0x80
[    1.053299]  [<ffffffffa01283ae>] ? gen4_read32+0x4e/0xc0 [i915]
[    1.053322]  [<ffffffffa0137b59>] intel_wait_for_vblank+0x209/0x210 [i915]
[    1.053347]  [<ffffffffa016e6f0>] intel_tv_detect+0x220/0x570 [i915]
[    1.053353]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[    1.053358]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[    1.053362]  [<ffffffffa00929a0>] drm_fb_helper_probe_connector_modes.isra.3+0x50/0x70 [drm_kms_helper]
[    1.053367]  [<ffffffffa0093acd>] drm_fb_helper_initial_config+0x15d/0x4d0 [drm_kms_helper]
[    1.053389]  [<ffffffffa0128252>] ? gen4_write32+0x52/0xb0 [i915]
[    1.053411]  [<ffffffffa011706d>] ? i915_hpd_irq_setup+0xcd/0xe0 [i915]
[    1.053434]  [<ffffffffa014e98f>] intel_fbdev_initial_config+0x1f/0x30 [i915]
[    1.053458]  [<ffffffffa01724ba>] i915_driver_load+0xf7a/0x1000 [i915]
[    1.053473]  [<ffffffffa002d9bd>] drm_dev_register+0xad/0x100 [drm]
[    1.053484]  [<ffffffffa003054f>] drm_get_pci_dev+0x8f/0x1f0 [drm]
[    1.053503]  [<ffffffffa00e84bb>] i915_pci_probe+0x3b/0x60 [i915]
[    1.053507]  [<ffffffff81336375>] local_pci_probe+0x45/0xa0
[    1.053509]  [<ffffffff81337525>] ? pci_match_device+0xe5/0x110
[    1.053512]  [<ffffffff81337689>] pci_device_probe+0xf9/0x150
[    1.053516]  [<ffffffff81418150>] driver_probe_device+0x90/0x3c0
[    1.053518]  [<ffffffff81418553>] __driver_attach+0x93/0xa0
[    1.053520]  [<ffffffff814184c0>] ? __device_attach+0x40/0x40
[    1.053524]  [<ffffffff81416093>] bus_for_each_dev+0x73/0xc0
[    1.053526]  [<ffffffff81417bee>] driver_attach+0x1e/0x20
[    1.053528]  [<ffffffff814177d0>] bus_add_driver+0x180/0x250
[    1.053531]  [<ffffffff81418d34>] driver_register+0x64/0xf0
[    1.053533]  [<ffffffff81335d0c>] __pci_register_driver+0x4c/0x50
[    1.053544]  [<ffffffffa00307ba>] drm_pci_init+0x10a/0x140 [drm]
[    1.053546]  [<ffffffffa01df000>] ? 0xffffffffa01defff
[    1.053562]  [<ffffffffa01df089>] i915_init+0x89/0x90 [i915]
[    1.053565]  [<ffffffff81002144>] do_one_initcall+0xd4/0x210
[    1.053569]  [<ffffffff811a3972>] ? __vunmap+0xb2/0x100
[    1.053572]  [<ffffffff810f1ce8>] load_module+0x2018/0x2520
[    1.053575]  [<ffffffff810ed6d0>] ? store_uevent+0x70/0x70
[    1.053578]  [<ffffffff810ee2a9>] ? copy_module_from_fd.isra.47+0x129/0x180
[    1.053581]  [<ffffffff810f23a6>] SyS_finit_module+0xa6/0xd0
[    1.053584]  [<ffffffff81661fe9>] system_call_fastpath+0x16/0x1b
[    1.053586] ---[ end trace 9f5b922836a2c553 ]---

[   39.037171] ------------[ cut here ]------------
[   39.037221] WARNING: CPU: 1 PID: 1151 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   39.037223] vblank wait timed out
[   39.037225] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi arc4 snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller iwldvm snd_hda_codec mac80211 snd_hwdep iTCO_wdt iTCO_vendor_support tg3 coretemp snd_seq iwlwifi snd_seq_device snd_pcm dell_laptop dcdbas ptp cfg80211 ppdev kvm_intel pps_core joydev dell_wmi kvm sparse_keymap pcspkr serio_raw i2c_i801 snd_timer lpc_ich rfkill sdhci_pci sdhci snd mmc_core
[   39.037278]  mfd_core wmi shpchp parport_pc parport soundcore acpi_cpufreq xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci firewire_ohci libahci i915 libata firewire_core crc_itu_t yenta_socket i2c_algo_bit drm_kms_helper drm i2c_core video
[   39.037303] CPU: 1 PID: 1151 Comm: X Tainted: G        W     3.16.1-1.el7.elrepo.x86_64 #1
[   39.037306] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   39.037308]  0000000000000000 00000000ee0ee4a7 ffff8800d7133a60 ffffffff81659d38
[   39.037312]  ffff8800d7133aa8 ffff8800d7133a98 ffffffff81072cad ffff880037a70000
[   39.037316]  0000000000071040 0000000000000007 00000000fffc049c 00000000000000aa
[   39.037321] Call Trace:
[   39.037328]  [<ffffffff81659d38>] dump_stack+0x45/0x56
[   39.037334]  [<ffffffff81072cad>] warn_slowpath_common+0x7d/0xa0
[   39.037337]  [<ffffffff81072d2c>] warn_slowpath_fmt+0x5c/0x80
[   39.037361]  [<ffffffffa01283ae>] ? gen4_read32+0x4e/0xc0 [i915]
[   39.037379]  [<ffffffffa0137b59>] intel_wait_for_vblank+0x209/0x210 [i915]
[   39.037397]  [<ffffffffa016e6f0>] intel_tv_detect+0x220/0x570 [i915]
[   39.037406]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   39.037412]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   39.037429]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   39.037439]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   39.037444]  [<ffffffff8121aa78>] ? fsnotify+0x238/0x310
[   39.037447]  [<ffffffff811ef4b0>] do_vfs_ioctl+0x2e0/0x4a0
[   39.037451]  [<ffffffff81282b86>] ? file_has_perm+0xa6/0xb0
[   39.037453]  [<ffffffff811ef6f1>] SyS_ioctl+0x81/0xa0
[   39.037456]  [<ffffffff8110e8f6>] ? __audit_syscall_exit+0x1f6/0x2a0
[   39.037459]  [<ffffffff81661fe9>] system_call_fastpath+0x16/0x1b
[   39.037460] ---[ end trace 9f5b922836a2c554 ]---

[   39.145168] ------------[ cut here ]------------
[   39.145218] WARNING: CPU: 0 PID: 1151 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   39.145220] vblank wait timed out
[   39.145222] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi arc4 snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller iwldvm snd_hda_codec mac80211 snd_hwdep iTCO_wdt iTCO_vendor_support tg3 coretemp snd_seq iwlwifi snd_seq_device snd_pcm dell_laptop dcdbas ptp cfg80211 ppdev kvm_intel pps_core joydev dell_wmi kvm sparse_keymap pcspkr serio_raw i2c_i801 snd_timer lpc_ich rfkill sdhci_pci sdhci snd mmc_core
[   39.145275]  mfd_core wmi shpchp parport_pc parport soundcore acpi_cpufreq xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci firewire_ohci libahci i915 libata firewire_core crc_itu_t yenta_socket i2c_algo_bit drm_kms_helper drm i2c_core video
[   39.145299] CPU: 0 PID: 1151 Comm: X Tainted: G        W     3.16.1-1.el7.elrepo.x86_64 #1
[   39.145302] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   39.145305]  0000000000000000 00000000ee0ee4a7 ffff8800d7133a60 ffffffff81659d38
[   39.145309]  ffff8800d7133aa8 ffff8800d7133a98 ffffffff81072cad ffff880037a70000
[   39.145313]  0000000000071040 000000000000000b 00000000fffc0508 00000000000000aa
[   39.145317] Call Trace:
[   39.145325]  [<ffffffff81659d38>] dump_stack+0x45/0x56
[   39.145330]  [<ffffffff81072cad>] warn_slowpath_common+0x7d/0xa0
[   39.145333]  [<ffffffff81072d2c>] warn_slowpath_fmt+0x5c/0x80
[   39.145360]  [<ffffffffa01283ae>] ? gen4_read32+0x4e/0xc0 [i915]
[   39.145377]  [<ffffffffa0137b59>] intel_wait_for_vblank+0x209/0x210 [i915]
[   39.145395]  [<ffffffffa016e6f0>] intel_tv_detect+0x220/0x570 [i915]
[   39.145404]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   39.145410]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   39.145427]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   39.145437]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   39.145442]  [<ffffffff811ef4b0>] do_vfs_ioctl+0x2e0/0x4a0
[   39.145445]  [<ffffffff81282b86>] ? file_has_perm+0xa6/0xb0
[   39.145448]  [<ffffffff811ddc1e>] ? ____fput+0xe/0x10
[   39.145450]  [<ffffffff811ef6f1>] SyS_ioctl+0x81/0xa0
[   39.145453]  [<ffffffff81661fe9>] system_call_fastpath+0x16/0x1b
[   39.145455] ---[ end trace 9f5b922836a2c555 ]---

[   39.275173] ------------[ cut here ]------------
[   39.275223] WARNING: CPU: 1 PID: 1151 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   39.275225] vblank wait timed out
[   39.275227] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi arc4 snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller iwldvm snd_hda_codec mac80211 snd_hwdep iTCO_wdt iTCO_vendor_support tg3 coretemp snd_seq iwlwifi snd_seq_device snd_pcm dell_laptop dcdbas ptp cfg80211 ppdev kvm_intel pps_core joydev dell_wmi kvm sparse_keymap pcspkr serio_raw i2c_i801 snd_timer lpc_ich rfkill sdhci_pci sdhci snd mmc_core
[   39.275281]  mfd_core wmi shpchp parport_pc parport soundcore acpi_cpufreq xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci firewire_ohci libahci i915 libata firewire_core crc_itu_t yenta_socket i2c_algo_bit drm_kms_helper drm i2c_core video
[   39.275306] CPU: 1 PID: 1151 Comm: X Tainted: G        W     3.16.1-1.el7.elrepo.x86_64 #1
[   39.275308] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   39.275311]  0000000000000000 00000000ee0ee4a7 ffff8800d7133a60 ffffffff81659d38
[   39.275315]  ffff8800d7133aa8 ffff8800d7133a98 ffffffff81072cad ffff880037a70000
[   39.275319]  0000000000071040 000000000000000f 00000000fffc058a 00000000000000aa
[   39.275323] Call Trace:
[   39.275331]  [<ffffffff81659d38>] dump_stack+0x45/0x56
[   39.275336]  [<ffffffff81072cad>] warn_slowpath_common+0x7d/0xa0
[   39.275340]  [<ffffffff81072d2c>] warn_slowpath_fmt+0x5c/0x80
[   39.275364]  [<ffffffffa01283ae>] ? gen4_read32+0x4e/0xc0 [i915]
[   39.275381]  [<ffffffffa0137b59>] intel_wait_for_vblank+0x209/0x210 [i915]
[   39.275400]  [<ffffffffa016e6f0>] intel_tv_detect+0x220/0x570 [i915]
[   39.275409]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   39.275415]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   39.275431]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   39.275442]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   39.275447]  [<ffffffff8121aa78>] ? fsnotify+0x238/0x310
[   39.275450]  [<ffffffff811ef4b0>] do_vfs_ioctl+0x2e0/0x4a0
[   39.275453]  [<ffffffff81282b86>] ? file_has_perm+0xa6/0xb0
[   39.275456]  [<ffffffff811ef6f1>] SyS_ioctl+0x81/0xa0
[   39.275459]  [<ffffffff8110e8f6>] ? __audit_syscall_exit+0x1f6/0x2a0
[   39.275462]  [<ffffffff81661fe9>] system_call_fastpath+0x16/0x1b
[   39.275463] ---[ end trace 9f5b922836a2c556 ]---

[   39.383167] ------------[ cut here ]------------
[   39.383217] WARNING: CPU: 0 PID: 1151 at drivers/gpu/drm/i915/intel_display.c:861 intel_wait_for_vblank+0x209/0x210 [i915]()
[   39.383219] vblank wait timed out
[   39.383221] Modules linked in: ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables snd_hda_codec_hdmi arc4 snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_controller iwldvm snd_hda_codec mac80211 snd_hwdep iTCO_wdt iTCO_vendor_support tg3 coretemp snd_seq iwlwifi snd_seq_device snd_pcm dell_laptop dcdbas ptp cfg80211 ppdev kvm_intel pps_core joydev dell_wmi kvm sparse_keymap pcspkr serio_raw i2c_i801 snd_timer lpc_ich rfkill sdhci_pci sdhci snd mmc_core
[   39.383275]  mfd_core wmi shpchp parport_pc parport soundcore acpi_cpufreq xfs libcrc32c sd_mod sr_mod crc_t10dif cdrom crct10dif_common ahci firewire_ohci libahci i915 libata firewire_core crc_itu_t yenta_socket i2c_algo_bit drm_kms_helper drm i2c_core video
[   39.383300] CPU: 0 PID: 1151 Comm: X Tainted: G        W     3.16.1-1.el7.elrepo.x86_64 #1
[   39.383303] Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19 06/13/2013
[   39.383305]  0000000000000000 00000000ee0ee4a7 ffff8800d7133a60 ffffffff81659d38
[   39.383309]  ffff8800d7133aa8 ffff8800d7133a98 ffffffff81072cad ffff880037a70000
[   39.383313]  0000000000071040 0000000000000013 00000000fffc05f6 00000000000000aa
[   39.383318] Call Trace:
[   39.383325]  [<ffffffff81659d38>] dump_stack+0x45/0x56
[   39.383330]  [<ffffffff81072cad>] warn_slowpath_common+0x7d/0xa0
[   39.383334]  [<ffffffff81072d2c>] warn_slowpath_fmt+0x5c/0x80
[   39.383359]  [<ffffffffa01283ae>] ? gen4_read32+0x4e/0xc0 [i915]
[   39.383377]  [<ffffffffa0137b59>] intel_wait_for_vblank+0x209/0x210 [i915]
[   39.383396]  [<ffffffffa016e6f0>] intel_tv_detect+0x220/0x570 [i915]
[   39.383404]  [<ffffffffa0090ac3>] drm_helper_probe_single_connector_modes_merge_bits+0x293/0x3a0 [drm_kms_helper]
[   39.383410]  [<ffffffffa0090be3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[   39.383427]  [<ffffffffa003672f>] drm_mode_getconnector+0x3ff/0x470 [drm]
[   39.383438]  [<ffffffffa0027a9c>] drm_ioctl+0x1ec/0x660 [drm]
[   39.383443]  [<ffffffff811ef4b0>] do_vfs_ioctl+0x2e0/0x4a0
[   39.383447]  [<ffffffff81282b86>] ? file_has_perm+0xa6/0xb0
[   39.383449]  [<ffffffff811ddc1e>] ? ____fput+0xe/0x10
[   39.383451]  [<ffffffff811ef6f1>] SyS_ioctl+0x81/0xa0
[   39.383454]  [<ffffffff81661fe9>] system_call_fastpath+0x16/0x1b
[   39.383456] ---[ end trace 9f5b922836a2c557 ]---
Comment 13 Alan Bartlett 2014-08-23 21:21:59 UTC
With reference to this regression in the i915 driver code:

linux-3.15.10 -- Good.
linux-3.16    -- Bad.
linux-3.16.1  -- Bad.

Please advise as to what I can do to help identify the defective code.

Ignoring this report will not cause it to "magically" disappear.
Comment 14 Alan Bartlett 2014-08-25 12:31:12 UTC
Expanding the list of good/bad kernels with reference to this regression in the Intel i915 driver code:

linux-3.15.10 -- Good.
linux-3.16-rc1 -- Bad.
linux-3.16-rc2 -- Bad.
linux-3.16-rc3 -- Bad.
linux-3.16-rc4 -- Bad.
linux-3.16-rc5 -- Bad.
linux-3.16-rc6 -- Bad.
linux-3.16-rc7 -- Bad.
linux-3.16     -- Bad.
linux-3.16.1   -- Bad.
linux-3.17-rc1 -- Bad.

Does this sub-system actually have (a) current maintainer(s)?
Comment 15 Jani Nikula 2014-08-25 12:52:22 UTC
(In reply to Alan Bartlett from comment #13)
> With reference to this regression in the i915 driver code:
> 
> linux-3.15.10 -- Good.
> linux-3.16    -- Bad.
> linux-3.16.1  -- Bad.
> 
> Please advise as to what I can do to help identify the defective code.

Please bisect between 3.15.10 and 3.16.
Comment 16 Alan Bartlett 2014-08-25 13:53:00 UTC
(In reply to Jani Nikula from comment #15)
> (In reply to Alan Bartlett from comment #13)
> > With reference to this regression in the i915 driver code:
> > 
> > linux-3.15.10 -- Good.
> > linux-3.16    -- Bad.
> > linux-3.16.1  -- Bad.
> > 
> > Please advise as to what I can do to help identify the defective code.
> 
> Please bisect between 3.15.10 and 3.16.

Unfortunately I do not have: (1) the knowledge or (2) the means to do so.

Any other suggestions, please?
Comment 17 Jani Nikula 2014-08-25 15:56:50 UTC
https://wiki.debian.org/DebianKernel/GitBisect
Comment 18 Alan Bartlett 2014-08-27 20:55:42 UTC
Created attachment 148531 [details]
dmesg; drm.debug=0xe passed to kernel at boot
Comment 19 Alan Bartlett 2014-08-27 21:04:18 UTC
After repeated git bisects, this is a synopsis from dmesg showing the "badness" from the last bad kernel --

[~]$ dmesg | grep -Ei 'cut here|error|warn'
[    0.938054] ------------[ cut here ]------------
[    0.938098] WARNING: CPU: 1 PID: 114 at drivers/gpu/drm/i915/intel_display.c:852 intel_wait_for_vblank+0x209/0x210 [i915]()
[    0.938150]  [<ffffffff8106d80d>] warn_slowpath_common+0x7d/0xa0
[    0.938154]  [<ffffffff8106d88c>] warn_slowpath_fmt+0x5c/0x80
[   33.760040] ------------[ cut here ]------------
[   33.760090] WARNING: CPU: 1 PID: 1157 at drivers/gpu/drm/i915/intel_display.c:852 intel_wait_for_vblank+0x209/0x210 [i915]()
[   33.760204]  [<ffffffff8106d80d>] warn_slowpath_common+0x7d/0xa0
[   33.760208]  [<ffffffff8106d88c>] warn_slowpath_fmt+0x5c/0x80
[   33.940041] ------------[ cut here ]------------
[   33.940092] WARNING: CPU: 1 PID: 1157 at drivers/gpu/drm/i915/intel_display.c:852 intel_wait_for_vblank+0x209/0x210 [i915]()
[   33.940204]  [<ffffffff8106d80d>] warn_slowpath_common+0x7d/0xa0
[   33.940208]  [<ffffffff8106d88c>] warn_slowpath_fmt+0x5c/0x80
[   34.166041] ------------[ cut here ]------------
[   34.166093] WARNING: CPU: 1 PID: 1157 at drivers/gpu/drm/i915/intel_display.c:852 intel_wait_for_vblank+0x209/0x210 [i915]()
[   34.166205]  [<ffffffff8106d80d>] warn_slowpath_common+0x7d/0xa0
[   34.166209]  [<ffffffff8106d88c>] warn_slowpath_fmt+0x5c/0x80
[   34.346040] ------------[ cut here ]------------
[   34.346091] WARNING: CPU: 1 PID: 1157 at drivers/gpu/drm/i915/intel_display.c:852 intel_wait_for_vblank+0x209/0x210 [i915]()
[   34.346203]  [<ffffffff8106d80d>] warn_slowpath_common+0x7d/0xa0
[   34.346207]  [<ffffffff8106d88c>] warn_slowpath_fmt+0x5c/0x80
[   34.451090] [drm:i965_irq_handler] *ERROR* pipe A underrun
[~]$

Here is the output of git bisect log --

[linux]$ git bisect log
git bisect start
# good: [1860e379875dfe7271c649058aeddffe5afd9d0d] Linux 3.15
git bisect good 1860e379875dfe7271c649058aeddffe5afd9d0d
# bad: [19583ca584d6f574384e17fe7613dfaeadcdc4a6] Linux 3.16
git bisect bad 19583ca584d6f574384e17fe7613dfaeadcdc4a6
# good: [7b215de3d0abbc4f6daf2efd19e8809af0564490] Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into next
git bisect good 7b215de3d0abbc4f6daf2efd19e8809af0564490
# bad: [0430e49b6e7c6b5e076be8fefdee089958c9adad] ima: introduce ima_kernel_read()
git bisect bad 0430e49b6e7c6b5e076be8fefdee089958c9adad
# good: [2937f5efa5754754daf46de745f67350f7f06ec2] Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86
git bisect good 2937f5efa5754754daf46de745f67350f7f06ec2
# bad: [bc1dfff04a5d4064ba0db1fab13f84ab4f333d2b] Merge branch 'drm-nouveau-next' of git://anongit.freedesktop.org/git/nouveau/linux-2.6 into drm-next
git bisect bad bc1dfff04a5d4064ba0db1fab13f84ab4f333d2b
# bad: [4fa62c890cea83f28c30e1d5dc8fc86f61210280] drm/i915: Move buffer pinning and ring selection to intel_crtc_page_flip()
git bisect bad 4fa62c890cea83f28c30e1d5dc8fc86f61210280
# good: [aeab0b5af7df88284d101abf8d121f0e913b81ff] drm/i915: disable runtime PM if RC6 is disabled
git bisect good aeab0b5af7df88284d101abf8d121f0e913b81ff
# bad: [9d0a6fa6c5e618bd978d625a215dc4a240ba3b3c] drm/i915: add render state initialization
git bisect bad 9d0a6fa6c5e618bd978d625a215dc4a240ba3b3c
# good: [8cc96e7c732b64b55fb959567083eb3025f942d4] drm/i915/chv: Add PIPESTAT register bits for Cherryview
git bisect good 8cc96e7c732b64b55fb959567083eb3025f942d4
# good: [ef9348c8605264342513f78d6256262886b63eab] drm/i915/chv: find the best divisor for the target clock v4
git bisect good ef9348c8605264342513f78d6256262886b63eab
# bad: [d8ffa60b52ab171e89aebdbdd96dbe2a2460a5dd] drm/i915: WARN_ON fence pin leaks
git bisect bad d8ffa60b52ab171e89aebdbdd96dbe2a2460a5dd
# good: [d7f25f23d2e0c7898c95b2a6fd84f6358588de48] drm/i915/chv: Implement stolen memory size detection
git bisect good d7f25f23d2e0c7898c95b2a6fd84f6358588de48
# good: [d1533379584f8edcfcabb024dffc1b334db8da0f] drm/i915: Ringbuffer signal func for the second BSD ring
git bisect good d1533379584f8edcfcabb024dffc1b334db8da0f
# bad: [56ef52cad5e37fca89638e4bad598a994ecc3d9f] drm/i915: Kill vblank waits after pipe enable on gmch platforms
git bisect bad 56ef52cad5e37fca89638e4bad598a994ecc3d9f
[linux]$

It appears that commit 56ef52cad5e37fca89638e4bad598a994ecc3d9f is the origin of this bug.

Please also note that this kernel also shows an error that originates from the i965_irq_handler --

[   34.451090] [drm:i965_irq_handler] *ERROR* pipe A underrun
Comment 20 Jani Nikula 2014-08-28 07:24:11 UTC
The regressing commit is

commit 56ef52cad5e37fca89638e4bad598a994ecc3d9f
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Thu May 8 19:23:15 2014 +0300

    drm/i915: Kill vblank waits after pipe enable on gmch platforms
    
    The pipe might not start to actually run until the port has been enabled
    (depends on the platform and port type). So don't try to wait for vblank
    after we enabled the pipe but haven't yet enabled the port.
    
    Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
    Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
    References: https://bugs.freedesktop.org/show_bug.cgi?id=77297
    Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Comment 21 Alan Bartlett 2014-09-05 14:18:22 UTC
(In reply to Jani Nikula from comment #20)
> The regressing commit is
> 
> commit 56ef52cad5e37fca89638e4bad598a994ecc3d9f
> Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Date:   Thu May 8 19:23:15 2014 +0300
> 
>     drm/i915: Kill vblank waits after pipe enable on gmch platforms
>     
>     The pipe might not start to actually run until the port has been enabled
>     (depends on the platform and port type). So don't try to wait for vblank
>     after we enabled the pipe but haven't yet enabled the port.
>     
>     Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
>     Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
>     References: https://bugs.freedesktop.org/show_bug.cgi?id=77297
>     Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

The defect was first noticed and reported on July 1st 2014. The current date is now September 5th 2014.

Has there been any action? Is there anything ready for me to test? A simple patch would be to revert the above commit. Unfortunately as other commits have now overlaid the regressing commit, it is not something I can do.

Maintainers -- Your comments, please.
Comment 22 Ville Syrjala 2014-09-05 15:26:07 UTC
Created attachment 149291 [details]
[PATCH] drm/i915: Wait for vblank before enabling the TV encoder

Given the bisect result this should get the old behaviour back, but just for the TV encoder. It doesn't really make any sense to me, but let's try it.
Comment 23 Ville Syrjala 2014-09-05 15:27:39 UTC
Created attachment 149301 [details]
[PATCH] drm/i915: Wait for vblank after enabling the TV encoder

Here's another version that places the vblank wait after enabling the TV encoder. This would make some sense to me given the comments in the TV detect code. Please report back which one of the patches work (or if neither or both work).
Comment 24 Alan Bartlett 2014-09-05 20:50:58 UTC
(In reply to Ville Syrjala from comment #22)
> Created attachment 149291 [details]
> [PATCH] drm/i915: Wait for vblank before enabling the TV encoder
> 
> Given the bisect result this should get the old behaviour back, but just for
> the TV encoder. It doesn't really make any sense to me, but let's try it.

Applying this patch to the linux-3.17-rc3 sources and building results in a kernel that is good.

[Duo2 ~] uname -r
3.17.0-0.rc3.149291.patch.el7.elrepo.x86_64
[Duo2 ~] dmesg | grep -Ei 'cut here|error|warning'
[    0.000000] ACPI BIOS Warning (bug): 32/64X length mismatch in FADT/Gpe0Block: 128/64 (20140724/tbfadt-618)
[    0.567754] i8042: Warning: Keylock active
[Duo2 ~]
Comment 25 Alan Bartlett 2014-09-05 20:54:33 UTC
(In reply to Ville Syrjala from comment #23)
> Created attachment 149301 [details]
> [PATCH] drm/i915: Wait for vblank after enabling the TV encoder
> 
> Here's another version that places the vblank wait after enabling the TV
> encoder. This would make some sense to me given the comments in the TV
> detect code. Please report back which one of the patches work (or if neither
> or both work).

Applying this patch to the linux-3.17-rc3 sources and building results in a kernel that is bad.

[Duo2 ~] uname -r
3.17.0-0.rc3.149301.patch.el7.elrepo.x86_64
[Duo2 ~] dmesg | grep -Ei 'cut here|error|warning'
[    0.000000] ACPI BIOS Warning (bug): 32/64X length mismatch in FADT/Gpe0Block: 128/64 (20140724/tbfadt-618)
[    0.560733] i8042: Warning: Keylock active
[   38.867040] ------------[ cut here ]------------
[   38.867096] WARNING: CPU: 0 PID: 1152 at drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x209/0x210 [i915]()
[   38.993037] ------------[ cut here ]------------
[   38.993094] WARNING: CPU: 0 PID: 1152 at drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x209/0x210 [i915]()
[   39.165040] ------------[ cut here ]------------
[   39.165097] WARNING: CPU: 0 PID: 1152 at drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x209/0x210 [i915]()
[   39.291040] ------------[ cut here ]------------
[   39.291096] WARNING: CPU: 0 PID: 1152 at drivers/gpu/drm/i915/intel_display.c:902 intel_wait_for_vblank+0x209/0x210 [i915]()
[Duo2 ~]
Comment 26 Alan Bartlett 2014-09-05 20:56:49 UTC
Created attachment 149341 [details]
dmesg file, 3.17.0-0.rc3.149301.patch.el7.elrepo.x86_64
Comment 27 Alan Bartlett 2014-09-05 21:00:15 UTC
Created attachment 149351 [details]
traces, 3.17.0-0.rc3.149301.patch.el7.elrepo.x86_64
Comment 28 Alan Bartlett 2014-09-08 14:02:41 UTC
Is there anything else you would like me to test?
Comment 29 Jani Nikula 2014-09-08 15:17:56 UTC
Fix pushed to drm-intel-fixes:

commit 7a98948f3b536ca9a077e84966ddc0e9f53726df
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Mon Sep 8 17:43:01 2014 +0300

    drm/i915: Wait for vblank before enabling the TV encoder

Thanks for the report and testing.
Comment 30 Alan Bartlett 2014-09-08 20:13:41 UTC
(In reply to Jani Nikula from comment #29)
> Fix pushed to drm-intel-fixes:
> 
> commit 7a98948f3b536ca9a077e84966ddc0e9f53726df
> Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Date:   Mon Sep 8 17:43:01 2014 +0300
> 
>     drm/i915: Wait for vblank before enabling the TV encoder
> 
> Thanks for the report and testing.

Unfortunately that patch does not provide a full fix.

Some further background information: 

The hardware, a Dell Latitude E5500, is configured to dual boot either RHEL-6 or RHEL-7. The relevant lines output by a 'lspci -nnv' command which defines the video subsystem is attached.

The linux-3.17-rc4 source was used, the above patch was applied and two kernels were built, one for the RHEL-6 system and another for the RHEL-7 system.

3.17.0-0.rc4.bcat.el6.elrepo.x86_64
3.17.0-0.rc4.bcat.el7.elrepo.x86_64

The RHEL-6 system generates a trace that refers to
"g4x_wait_for_vblank+0xd5/0xf0 [i915]()", "vblank wait timed out" and also mentions "*ERROR* pipe A underrun".

The RHEL-7 system generates a trace that refers to "intel_wait_for_vblank+0x209/0x210 [i915]()", "vblank wait timed out".

Both traces, suitably labelled, are attached.
Comment 31 Alan Bartlett 2014-09-08 20:14:49 UTC
Created attachment 149521 [details]
Trace, from RHEL-6 system.
Comment 32 Alan Bartlett 2014-09-08 20:15:31 UTC
Created attachment 149531 [details]
Trace, from RHEL-7 system.
Comment 33 Jani Nikula 2014-09-09 07:20:54 UTC
(In reply to Alan Bartlett from comment #24)
> (In reply to Ville Syrjala from comment #22)
> > Created attachment 149291 [details]
> > [PATCH] drm/i915: Wait for vblank before enabling the TV encoder
> > 
> > Given the bisect result this should get the old behaviour back, but just
> for
> > the TV encoder. It doesn't really make any sense to me, but let's try it.
> 
> Applying this patch to the linux-3.17-rc3 sources and building results in a
> kernel that is good.

What "good" is it if it doesn't fix the problem after all? I'm undecided whether I should revert the commit if it doesn't fix the problem.
Comment 34 Alan Bartlett 2014-09-09 14:55:40 UTC
(In reply to Jani Nikula from comment #33)
> (In reply to Alan Bartlett from comment #24)
> > (In reply to Ville Syrjala from comment #22)
> > > Created attachment 149291 [details]
> > > [PATCH] drm/i915: Wait for vblank before enabling the TV encoder
> > > 
> > > Given the bisect result this should get the old behaviour back, but just
> for
> > > the TV encoder. It doesn't really make any sense to me, but let's try it.
> > 
> > Applying this patch to the linux-3.17-rc3 sources and building results in a
> > kernel that is good.
> 
> What "good" is it if it doesn't fix the problem after all? I'm undecided
> whether I should revert the commit if it doesn't fix the problem.

I only deal in facts. Here are some further facts for you:

(1) If this issue had been "picked up" when it was first reported against 3.16-rc3 then it would not be so difficult to correct.

(2) A warm-boot results in the situation as described in comment 30, with the traces attached (comments 31 & 32).

(3) A cold boot does not show this issue so, in fact, commit 7a98948f3b536ca9a077e84966ddc0e9f53726df does fix the issue. However . . .

(4) Unfortunately a new problem is now found. This latest problem does also result in a "vblank wait timed out" message. Its origin is is "drivers/gpu/drm/i915/intel_display.c:902 g4x_wait_for_vblank+0xd5/0xf0 [i915]()". That is to say from g4x_wait_for_vblank()

Some comments for you:

(1) If you would like to revert a commit, then the correct target for reversion is commit 56ef52cad5e37fca89638e4bad598a994ecc3d9f and everything that followed on and was applied on top of it.

(2) As thing stand, all kernels > 3.15.10 are "bad" unless commit 7a98948f3b536ca9a077e84966ddc0e9f53726df is applied.

(3) Applying commit 7a98948f3b536ca9a077e84966ddc0e9f53726df causes a new but similar problem in that another "vblank wait timed out" trace is now output.

A question for you:

(1) Do you want a fresh bug report to be opened for the new "vblank wait timed out" originating from "drivers/gpu/drm/i915/intel_display.c:902 g4x_wait_for_vblank+0xd5/0xf0 [i915]()" ?
Comment 35 Ville Syrjala 2014-09-10 10:33:28 UTC
(In reply to Alan Bartlett from comment #34)
> (1) Do you want a fresh bug report to be opened for the new "vblank wait
> timed out" originating from "drivers/gpu/drm/i915/intel_display.c:902
> g4x_wait_for_vblank+0xd5/0xf0 [i915]()" ?

Are you saying you're not getting this other vblank wait timeout with an unpatched kernel?
Comment 36 Alan Bartlett 2014-09-10 11:28:46 UTC
(In reply to Ville Syrjala from comment #35)
> (In reply to Alan Bartlett from comment #34)
> > (1) Do you want a fresh bug report to be opened for the new "vblank wait
> > timed out" originating from "drivers/gpu/drm/i915/intel_display.c:902
> > g4x_wait_for_vblank+0xd5/0xf0 [i915]()" ?
> 
> Are you saying you're not getting this other vblank wait timeout with an
> unpatched kernel?

No. There has been evidence of the other vblank wait timeout ("g4x_wait_for_vblank") with vanilla (unpatched) kernels. Examples can be found in some of the traces, earlier in this report (shown above).

I have performed a whole series of tests with the 3.17-rc4 kernel which includes the patch. The results are inconsistent. At first I thought it was the difference between a warm boot and a cold boot but further testing shows it not to be the case.

Sometimes there can be a completely successful boot and no traces are produced, yet on other times either one or two call traces are produced. (For completeness, I will mention that sometimes there is a mention of a "*ERROR* pipe A underrun", yet on other occasions there is not.)

The only tentative suggestion I can make to account for these varying results is that it is a timing effect.

There is only one definite conclusion I can currently make and that is the i915 code is broken for *all* kernels > 3.15.10

I am still prepared to assist with testing -- as long as it does not consume all of my time to the detriment of other tasks.
Comment 37 Alan Bartlett 2014-09-15 12:35:37 UTC
I shall shortly be building 3.17-rc5. 

Is there anything I can do that may help to elucidate the root cause of this problem? (Apart from reverting all i915 code commits since 3.15.X)
Comment 38 Alan Bartlett 2014-09-23 14:24:15 UTC
With a build of 3.17-rc6 and testing --

* with both RHEL6 & RHEL7
* with & without "drm.debug=0xe" on the kernel command line
* in both text and graphical modes

-- in all permutations, I can now say that this issue has finally been resolved.

It is irritating that no clear reproducer could be identified and I suspect that the trigger will never be known. So it is best filed under the heading of "one of life's little mysteries".

I shall now close this bug as "resolved/code_fix" and thank you for helping.

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