s2ram sometimes looks very unreliable on my laptop. Usually it suspends without any issues but sometimes it just freezes after/while resuming. It crashes in various of places related to Intel GPU, but usually with blank display and without any stacktraces in logs: --- grep --- Feb 23 11:48:25 laptop kernel: [22138.764489] kernel BUG at drivers/gpu/drm/i915/i915_gem.c:4190! Feb 24 20:18:21 laptop kernel: [70267.532366] kernel BUG at drivers/gpu/drm/i915/i915_gem.c:4238! Feb 25 10:16:05 laptop kernel: [23325.739378] kernel BUG at drivers/gpu/drm/i915/i915_gem.c:4238! --- grep --- Today I've hit something like this once more but I was able to shutdown machine using SysRQ keys. And here is a trace: [116757.202070] ------------[ cut here ]------------ [116757.202073] kernel BUG at drivers/gpu/drm/i915/intel_ringbuffer.c:343! [116757.202076] invalid opcode: 0000 [#1] PREEMPT SMP [116757.202079] last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/graphics/fb0/state [116757.202081] Modules linked in: msr cpufreq_stats nls_iso8859_1 nls_cp437 vfat fat keucr(C) tun ppp_deflate bsd_comp ppp_async crc_ccitt ppp_generic slhc rfcomm bnep l2cap crc16 sco btusb bluetooth xt_recent ipt_LOG ipt_REJECT xt_tcpudp xt_state iptable_filter iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables acpi_cpufreq mperf fuse coretemp loop joydev arc4 ecb snd_hda_codec_hdmi snd_hda_codec_realtek iwlagn snd_hda_intel iwlcore snd_hda_codec snd_hwdep snd_pcm uvcvideo snd_seq mac80211 snd_timer snd_seq_device asus_laptop tpm_tis psmouse videodev snd ac soundcore v4l1_compat cfg80211 tpm sparse_keymap snd_page_alloc pcspkr serio_raw tpm_bios processor battery rfkill evdev sha256_generic aes_i586 aes_generic cbc dm_crypt dm_mod btrfs zlib_deflate crc32c libcrc32c reiserfs lzo ext3 jbd mbcache i915 drm_kms_helper drm i2c_algo_bit i2c_core sg sr_mod sd_mod crc_t10dif cdrom usb_storage uas ahci libahci libata scsi_mod thermal video ehci_hcd usbcor e thermal_sys output button r8169 mii nls_base [last unloaded: uhci_hcd] [116757.202150] [116757.202153] Pid: 2635, comm: Xorg Tainted: G C 2.6.37.1+ #5 ASUSTeK Computer Inc. F6A /F6A [116757.202158] EIP: 0060:[<f87dd9a2>] EFLAGS: 00210046 CPU: 1 [116757.202187] EIP is at render_ring_put_user_irq+0x37/0x80 [i915] [116757.202190] EAX: 00000000 EBX: f4ca4000 ECX: f4ca4080 EDX: f4ca4018 [116757.202193] ESI: f6fe3400 EDI: f4ca429c EBP: f6d05e2c ESP: f6d05e18 [116757.202195] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [116757.202198] Process Xorg (pid: 2635, ti=f6d04000 task=f6be8000 task.ti=f6d04000) [116757.202200] Stack: [116757.202201] f4ca4018 00200296 f4ca4018 f4ca4080 00000001 f6d05e54 f87c3996 f4ca4000 [116757.202207] 00000001 f4ca4080 f6fe3400 00000001 f40fc780 00000000 f6d05e94 f6d05e70 [116757.202213] f87c67b4 f6d66380 f6fe3400 f6d66380 00000008 00000057 f6d05f24 f8711687 [116757.202219] Call Trace: [116757.202247] [<f87c3996>] ? i915_gem_retire_requests_ring+0x159/0x16e [i915] [116757.202273] [<f87c67b4>] ? i915_gem_busy_ioctl+0x98/0xbd [i915] [116757.202299] [<f8711687>] ? drm_ioctl+0x278/0x345 [drm] [116757.202321] [<f87c671c>] ? i915_gem_busy_ioctl+0x0/0xbd [i915] [116757.202337] [<c109aa2f>] ? __pagevec_free+0x63/0x70 [116757.202342] [<c109d222>] ? release_pages+0x11d/0x125 [116757.202346] [<c10abf1e>] ? free_pgd_range+0xe5/0x150 [116757.202352] [<c102adaf>] ? get_parent_ip+0xb/0x31 [116757.202370] [<f871140f>] ? drm_ioctl+0x0/0x345 [drm] [116757.202374] [<c10ce2a7>] ? do_vfs_ioctl+0x44d/0x492 [116757.202379] [<c10bec57>] ? __slab_free+0x56/0xbc [116757.202383] [<c10bf1b1>] ? kmem_cache_free+0x67/0xaf [116757.202386] [<c10aebb4>] ? remove_vma+0x41/0x47 [116757.202389] [<c10af8ba>] ? do_munmap+0x217/0x231 [116757.202392] [<c10ce32d>] ? sys_ioctl+0x41/0x61 [116757.202397] [<c10031df>] ? sysenter_do_call+0x12/0x28 [116757.202402] [<c12a0000>] ? perf_cpu_notify+0xfd/0x128 [116757.202404] Code: 98 1c 02 00 00 89 55 ec 8d bb 9c 02 00 00 89 f8 e8 ac 4a ac c8 8b 55 ec 83 be 30 01 00 00 00 89 45 f0 74 3f 8b 42 40 85 c0 7f 04 <0f> 0b eb fe 48 85 c0 89 42 40 75 2c 8b 86 1c 02 00 00 8b 40 04 [116757.202427] EIP: [<f87dd9a2>] render_ring_put_user_irq+0x37/0x80 [i915] SS:ESP 0068:f6d05e18 [116757.202457] ---[ end trace 3de69b1451c44e14 ]--- And another one just after this (maybe caused by previous one): [116757.202457] ---[ end trace 3de69b1451c44e14 ]--- Mar 1 06:26:43 laptop kernel: [116757.202460] note: Xorg[2635] exited with preempt_count 1 Mar 1 06:26:43 laptop kernel: [116757.204057] BUG: scheduling while atomic: Xorg/2635/0x10000002 Mar 1 06:26:43 laptop kernel: [116757.204058] Modules linked in: msr cpufreq_stats nls_iso8859_1 nls_cp437 vfat fat keucr(C) tun ppp_deflate bsd_comp ppp_async crc_ccitt ppp_generic slhc rfcomm bnep l2cap crc16 sco btusb bluetooth xt_recent ipt_LOG ipt_REJECT xt_tcpudp xt_state iptable_filter iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables acpi_cpufreq mperf fuse coretemp loop joydev arc4 ecb snd_hda_codec_hdmi snd_hda_codec_realtek iwlagn snd_hda_intel iwlcore snd_hda_codec snd_hwdep snd_pcm uvcvideo snd_seq mac80211 snd_timer snd_seq_device asus_laptop tpm_tis psmouse videodev snd ac soundcore v4l1_compat cfg80211 tpm sparse_keymap snd_page_alloc pcspkr serio_raw tpm_bios processor battery rfkill evdev sha256_generic aes_i586 aes_generic cbc dm_crypt dm_mod btrfs zlib_deflate crc32c libcrc32c reiserfs lzo ext3 jbd mbcache i915 drm_kms_helper drm i2c_algo_bit i2c_core sg sr_mod sd_mod crc_t10dif cdrom usb_storage uas ahci libahci libata scsi_mod thermal video ehci_hcd usbcor Mar 1 06:26:43 laptop kernel: e thermal_sys output button r8169 mii nls_base [last unloaded: uhci_hcd] Mar 1 06:26:43 laptop kernel: [116757.204130] Pid: 2635, comm: Xorg Tainted: G D C 2.6.37.1+ #5 Mar 1 06:26:43 laptop kernel: [116757.204132] Call Trace: Mar 1 06:26:43 laptop kernel: [116757.204136] [<c102c362>] __schedule_bug+0x4c/0x51 Mar 1 06:26:43 laptop kernel: [116757.204140] [<c12a0a82>] schedule+0xa9/0x6c3 Mar 1 06:26:43 laptop kernel: [116757.204145] [<c109d570>] ? lru_add_drain+0x74/0x8c Mar 1 06:26:43 laptop kernel: [116757.204149] [<c10b5a1d>] ? free_pages_and_swap_cache+0x43/0x50 Mar 1 06:26:43 laptop kernel: [116757.204152] [<c102db17>] __cond_resched+0x12/0x1e Mar 1 06:26:43 laptop kernel: [116757.204155] [<c12a1191>] _cond_resched+0x1e/0x29 Mar 1 06:26:43 laptop kernel: [116757.204159] [<c10aad2a>] unmap_vmas+0x5aa/0x608 Mar 1 06:26:43 laptop kernel: [116757.204164] [<c1150cd5>] ? vsnprintf+0x81/0x24c Mar 1 06:26:43 laptop kernel: [116757.204168] [<c10aec34>] exit_mmap+0x7a/0xc0 Mar 1 06:26:43 laptop kernel: [116757.204171] [<c1031966>] mmput+0x37/0xab Mar 1 06:26:43 laptop kernel: [116757.204175] [<c1034ffa>] exit_mm+0xfc/0x104 Mar 1 06:26:43 laptop kernel: [116757.204178] [<c10368bc>] do_exit+0x1ec/0x63d Mar 1 06:26:43 laptop kernel: [116757.204181] [<c10343b7>] ? kmsg_dump+0xee/0x103 Mar 1 06:26:43 laptop kernel: [116757.204185] [<c12a3aaa>] oops_end+0x98/0xa0 Mar 1 06:26:43 laptop kernel: [116757.204189] [<c1005689>] die+0x53/0x59 Mar 1 06:26:43 laptop kernel: [116757.204192] [<c12a33d3>] do_trap+0x89/0xa2 Mar 1 06:26:43 laptop kernel: [116757.204195] [<c1003a58>] ? do_invalid_op+0x0/0x80 Mar 1 06:26:43 laptop kernel: [116757.204198] [<c1003ace>] do_invalid_op+0x76/0x80 Mar 1 06:26:43 laptop kernel: [116757.204224] [<f87dd9a2>] ? render_ring_put_user_irq+0x37/0x80 [i915] Mar 1 06:26:43 laptop kernel: [116757.204228] [<c12a529f>] ? sub_preempt_count+0x7c/0x89 Mar 1 06:26:43 laptop kernel: [116757.204232] [<c10beb15>] ? T.1006+0x11/0x26 Mar 1 06:26:43 laptop kernel: [116757.204235] [<c10bec57>] ? __slab_free+0x56/0xbc Mar 1 06:26:43 laptop kernel: [116757.204238] [<c10bf1b1>] ? kmem_cache_free+0x67/0xaf Mar 1 06:26:43 laptop kernel: [116757.204241] [<c10d02f8>] ? __d_free+0x39/0x3c Mar 1 06:26:43 laptop kernel: [116757.204245] [<c102adaf>] ? get_parent_ip+0xb/0x31 Mar 1 06:26:43 laptop kernel: [116757.204249] [<c12a529f>] ? sub_preempt_count+0x7c/0x89 Mar 1 06:26:43 laptop kernel: [116757.204252] [<c12a318b>] error_code+0x67/0x6c Mar 1 06:26:43 laptop kernel: [116757.204255] [<c12a007b>] ? start_cpu_timer+0x44/0x50 Mar 1 06:26:43 laptop kernel: [116757.204281] [<f87dd9a2>] ? render_ring_put_user_irq+0x37/0x80 [i915] Mar 1 06:26:43 laptop kernel: [116757.204304] [<f87c3996>] i915_gem_retire_requests_ring+0x159/0x16e [i915] Mar 1 06:26:43 laptop kernel: [116757.204326] [<f87c67b4>] i915_gem_busy_ioctl+0x98/0xbd [i915] Mar 1 06:26:43 laptop kernel: [116757.204347] [<f8711687>] drm_ioctl+0x278/0x345 [drm] Mar 1 06:26:43 laptop kernel: [116757.204368] [<f87c671c>] ? i915_gem_busy_ioctl+0x0/0xbd [i915] Mar 1 06:26:43 laptop kernel: [116757.204378] [<c109aa2f>] ? __pagevec_free+0x63/0x70 Mar 1 06:26:43 laptop kernel: [116757.204382] [<c109d222>] ? release_pages+0x11d/0x125 Mar 1 06:26:43 laptop kernel: [116757.204385] [<c10abf1e>] ? free_pgd_range+0xe5/0x150 Mar 1 06:26:43 laptop kernel: [116757.204389] [<c102adaf>] ? get_parent_ip+0xb/0x31 Mar 1 06:26:43 laptop kernel: [116757.204405] [<f871140f>] ? drm_ioctl+0x0/0x345 [drm] Mar 1 06:26:43 laptop kernel: [116757.204409] [<c10ce2a7>] do_vfs_ioctl+0x44d/0x492 Mar 1 06:26:43 laptop kernel: [116757.204412] [<c10bec57>] ? __slab_free+0x56/0xbc Mar 1 06:26:43 laptop kernel: [116757.204415] [<c10bf1b1>] ? kmem_cache_free+0x67/0xaf Mar 1 06:26:43 laptop kernel: [116757.204419] [<c10aebb4>] ? remove_vma+0x41/0x47 Mar 1 06:26:43 laptop kernel: [116757.204421] [<c10af8ba>] ? do_munmap+0x217/0x231 Mar 1 06:26:43 laptop kernel: [116757.204425] [<c10ce32d>] sys_ioctl+0x41/0x61 Mar 1 06:26:43 laptop kernel: [116757.204428] [<c10031df>] sysenter_do_call+0x12/0x28 Mar 1 06:26:43 laptop kernel: [116757.204432] [<c12a0000>] ? perf_cpu_notify+0xfd/0x128 -- lspci: 00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07) 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) 00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) 00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03) 00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03) 00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03) 00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03) 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03) 00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03) 00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03) 00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03) 00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 03) 00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03) 00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03) 00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03) 00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93) 00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03) 00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03) 02:00.0 Network controller: Intel Corporation WiFi Link 5100 05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
Is this a regression? Was any earlier kernel version OK? If so, which version? Thanks.
I'm not sure.. Actually .36 also has this issue. Probably it's not a regression.
Created attachment 49712 [details] dmesg from clean boot
I was able to get stacktrace for crash on suspend (not resume): [41504.484027] kernel BUG at drivers/gpu/drm/i915/i915_gem.c:4238! [41504.484029] invalid opcode: 0000 [#1] PREEMPT SMP [41504.484032] last sysfs file: /sys/devices/virtual/sound/timer/uevent [41504.484035] Modules linked in: tun xt_recent ipt_LOG ipt_REJECT xt_tcpudp xt_state iptable_filter iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables acpi_cpufreq mperf fuse coretemp loop snd_hda_codec_hdmi arc4 snd_hda_codec_realtek ecb snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq snd_timer iwlagn snd_seq_device iwlcore mac80211 snd soundcore uvcvideo videodev snd_page_alloc tpm_tis tpm v4l1_compat cfg80211 psmouse joydev asus_laptop tpm_bios serio_raw pcspkr battery ac processor sparse_keymap evdev rfkill hid_microsoft usbhid hid sha256_generic aes_i586 aes_generic cbc dm_crypt dm_mod btrfs zlib_deflate crc32c libcrc32c reiserfs lzo ext3 jbd mbcache i915 drm_kms_helper drm i2c_algo_bit i2c_core sg sr_mod sd_mod crc_t10dif cdrom usb_storage uas ahci libahci libata uhci_hcd r8169 thermal scsi_mod mii video thermal_sys output ehci_hcd usbcore button nls_base [last unloaded: scsi_wait_scan] [41504.484091] [41504.484094] Pid: 4519, comm: Xorg Not tainted 2.6.37.1+ #5 ASUSTeK Computer Inc. F6A /F6A [41504.484099] EIP: 0060:[<f87b6e9d>] EFLAGS: 00213246 CPU: 1 [41504.484119] EIP is at i915_gem_object_unpin+0x30/0x7d [i915] [41504.484122] EAX: f4fc2900 EBX: 0003c000 ECX: 0003c07c EDX: f4ca4000 [41504.484124] ESI: f684bc14 EDI: f684beb0 EBP: f6c45b28 ESP: f6c45b20 [41504.484127] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [41504.484130] Process Xorg (pid: 4519, ti=f6c44000 task=f6a88000 task.ti=f6c44000) [41504.484132] Stack: [41504.484133] f6881000 f684bc14 f6c45b38 f87bef9b f6881000 f87e3f5c f6c45b50 f8746e8f [41504.484139] f684be98 f686d1e4 00000000 f684bd40 f6c45bc0 f8748154 c1025665 f6cb4b40 [41504.484145] 00000004 f6cb4b40 f684beb0 f684bea4 f684beb0 f87e3f5c f684be98 ec6e1000 [41504.484150] Call Trace: [41504.484173] [<f87bef9b>] ? intel_crtc_disable+0x31/0x3c [i915] [41504.484186] [<f8746e8f>] ? drm_helper_disable_unused_functions+0xeb/0x129 [drm_kms_helper] [41504.484193] [<f8748154>] ? drm_crtc_helper_set_config+0x5d8/0x72c [drm_kms_helper] [41504.484199] [<c1025665>] ? check_preempt_curr+0x39/0x6b [41504.484205] [<c1030d00>] ? try_to_wake_up+0x12a/0x224 [41504.484212] [<f8746535>] ? drm_fb_helper_set_par+0x5c/0x97 [drm_kms_helper] [41504.484218] [<c116f8d5>] ? fb_set_var+0x208/0x2ff [41504.484223] [<c102fe57>] ? load_balance+0x9a/0x5d1 [41504.484228] [<c10a3ba2>] ? shmem_truncate_range+0x24/0x606 [41504.484232] [<c1008855>] ? __switch_to_xtra+0x129/0x148 [41504.484237] [<c102adaf>] ? get_parent_ip+0xb/0x31 [41504.484241] [<c12a529f>] ? sub_preempt_count+0x7c/0x89 [41504.484245] [<c11777b9>] ? fbcon_blank+0x7e/0x27b [41504.484251] [<c11bbc46>] ? do_unblank_screen+0xcc/0x12f [41504.484256] [<c11b4a43>] ? vt_ioctl+0x49e/0x1643 [41504.484261] [<c12a25e5>] ? _raw_spin_unlock+0x1b/0x26 [41504.484264] [<c1096365>] ? find_get_page+0x66/0x6f [41504.484268] [<c102adaf>] ? get_parent_ip+0xb/0x31 [41504.484271] [<c102adaf>] ? get_parent_ip+0xb/0x31 [41504.484274] [<c12a529f>] ? sub_preempt_count+0x7c/0x89 [41504.484278] [<c11b45a5>] ? vt_ioctl+0x0/0x1643 [41504.484283] [<c11acb59>] ? tty_ioctl+0x7d0/0x832 [41504.484287] [<c10acd46>] ? handle_mm_fault+0x3a4/0x875 [41504.484291] [<c11ac389>] ? tty_ioctl+0x0/0x832 [41504.484295] [<c10ce2a7>] ? do_vfs_ioctl+0x44d/0x492 [41504.484299] [<c12a51f5>] ? do_page_fault+0x2ec/0x31a [41504.484303] [<c10c4372>] ? fput+0x151/0x159 [41504.484306] [<c10ce32d>] ? sys_ioctl+0x41/0x61 [41504.484309] [<c10c188f>] ? sys_close+0x6c/0xa0 [41504.484314] [<c10031df>] ? sysenter_do_call+0x12/0x28 [41504.484316] Code: 8b 48 78 8b 50 08 89 cb 81 e1 ff 3f fc ff c1 eb 0e 8b 92 1c 02 00 00 83 c3 0f 83 e3 0f c1 e3 0e 09 d9 83 78 54 00 89 48 78 75 04 <0f> 0b eb fe 81 e1 00 c0 03 00 75 3d f6 40 78 01 75 28 8b 70 60 [41504.484341] EIP: [<f87b6e9d>] i915_gem_object_unpin+0x30/0x7d [i915] SS:ESP 0068:f6c45b20 [41504.485029] ---[ end trace 39adb58f3e75513b ]---
Do you use the s2ram binary? If you do, have you tried to disable it (eg. by making in non-executable)?
I use pm-utils to suspend/resume. I'm not sure how it works internally. Maybe it calls s2ram. However I've just tried to suspend without any userspace stuff using "echo mem > /sys/power/state". I've tested it two times and both of them were lucky. So probably this laptop do not require any userspace hacks/quirks. I can't say that this "fixes" issues because it is not always reproduceable. So I can continue to use /sys/power/state directly for some time and then post here results. Anything else I can try?
These are two different bugs both fixed. Oops on resume: commit 01a03331e5fe91861937f8b8e72c259f5e9eae67 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Jan 4 22:22:56 2011 +0000 drm/i915/ringbuffer: Simplify the ring irq refcounting ... and move it under the spinlock to gain the appropriate memory barriers. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=32752 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Oops on suspend: commit 9334ef755f060e251f3f395caeda1a58b6834ea3 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Fri Jan 28 11:53:03 2011 +0000 drm: Don't switch fb when disabling an output In drm_crtc_helper_set_config, we call drm_crtc_helper_set_mode which may return early and do no operation if the crtc is to be disabled. In this case we merrily swap to the new fb, discarding the old_fb believing that it has been cleaned up. However, due to the early return, the old_fb was not presented to the backend for correct reaping, and nor was the new one - which is about to be reaped via the drm_helper_disable_unused_functions(), leading to incorrect refcounting of the pinned objects. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=27722 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29857 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29230 Tested-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>