All was ok, until I ran "inteltool -a" from the root. The sources are latest from "git clone http://review.coreboot.org/coreboot.git". [ 155.422307] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [ 155.422325] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [ 155.422343] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [ 155.422361] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [ 155.422378] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [ 155.422390] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A [ 155.422396] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [ 155.422416] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A [ 155.422422] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun [ 155.422551] [drm:hsw_unclaimed_reg_detect.isra.13 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem. [ 155.422570] [drm:hsw_unclaimed_reg_detect.isra.13 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem. [ 155.437379] [drm:intel_uncore_check_errors [i915]] *ERROR* Unclaimed register before interrupt [ 155.470712] ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/i915/intel_display.c:9756 intel_check_page_flip+0xdb/0xf0 [i915]() [ 155.470734] Kicking stuck page flip: queued at 9245, now 9249 [ 155.470734] Modules linked in: bnep bluetooth rfkill fuse nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ebtable_broute bridge 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 snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_hda_controller snd_hda_codec intel_rapl iosf_mbi x86_pkg_temp_thermal snd_hwdep snd_seq snd_seq_device coretemp kvm_intel snd_pcm snd_timer mei_me snd mei iTCO_wdt iTCO_vendor_support tpm_infineon kvm soundcore i2c_i801 ppdev lpc_ich tpm_tis shpchp tpm parport_pc [ 155.470750] mfd_core parport serio_raw nfsd auth_rpcgss nfs_acl lockd grace vfat fat squashfs 8021q garp stp llc mrp i915 i2c_algo_bit drm_kms_helper mxm_wmi e1000e drm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ptp pps_core video wmi uas usb_storage scsi_dh_rdac scsi_dh_emc scsi_dh_alua sunrpc loop [ 155.470762] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.0.4-301.fc22.x86_64 #1 [ 155.470763] Hardware name: MSI MS-7830/CSM-Q87M-E43 (MS-7830), BIOS V10.4 07/19/2014 [ 155.470764] 0000000000000000 82a4245fb1a1ac06 ffff88011ea03d08 ffffffff81782644 [ 155.470765] 0000000000000000 ffff88011ea03d60 ffff88011ea03d48 ffffffff8109c66a [ 155.470766] ffff88011ea03d78 ffff8800d3797800 ffff8800d369d000 0000000000000000 [ 155.470768] Call Trace: [ 155.470769] <IRQ> [<ffffffff81782644>] dump_stack+0x45/0x57 [ 155.470775] [<ffffffff8109c66a>] warn_slowpath_common+0x8a/0xc0 [ 155.470776] [<ffffffff8109c6f5>] warn_slowpath_fmt+0x55/0x70 [ 155.470786] [<ffffffffa023b08b>] intel_check_page_flip+0xdb/0xf0 [i915] [ 155.470794] [<ffffffffa0206f2c>] ironlake_irq_handler+0x2ac/0xff0 [i915] [ 155.470797] [<ffffffff8110641d>] ? hrtimer_get_next_event+0x3d/0x90 [ 155.470798] [<ffffffff8110538a>] ? get_next_timer_interrupt+0x1fa/0x270 [ 155.470801] [<ffffffff810f45d7>] handle_irq_event_percpu+0x77/0x1a0 [ 155.470803] [<ffffffff810f473b>] handle_irq_event+0x3b/0x60 [ 155.470804] [<ffffffff810f795e>] handle_edge_irq+0x6e/0x120 [ 155.470808] [<ffffffff81016514>] handle_irq+0x74/0x140 [ 155.470811] [<ffffffff810bc57a>] ? atomic_notifier_call_chain+0x1a/0x20 [ 155.470814] [<ffffffff8178ba1f>] do_IRQ+0x4f/0xf0 [ 155.470816] [<ffffffff8178976d>] common_interrupt+0x6d/0x6d [ 155.470816] <EOI> [<ffffffff81618b7d>] ? cpuidle_enter_state+0x5d/0x170 [ 155.470819] [<ffffffff81618b6d>] ? cpuidle_enter_state+0x4d/0x170 [ 155.470820] [<ffffffff81618cc7>] cpuidle_enter+0x17/0x20 [ 155.470822] [<ffffffff810df3c4>] cpu_startup_entry+0x314/0x430 [ 155.470824] [<ffffffff81778e87>] rest_init+0x77/0x80 [ 155.470826] [<ffffffff81d39040>] start_kernel+0x4a0/0x4c1 [ 155.470828] [<ffffffff81d38120>] ? early_idt_handlers+0x120/0x120 [ 155.470830] [<ffffffff81d38339>] x86_64_start_reservations+0x2a/0x2c [ 155.470831] [<ffffffff81d3849c>] x86_64_start_kernel+0x161/0x184 [ 155.470832] ---[ end trace cc54eee76241682a ]--- [ 156.912873] systemd-journald[816]: /dev/kmsg buffer overrun, some messages lost.
(In reply to Anton Kochkov from comment #0) > All was ok, until I ran "inteltool -a" from the root. Don't do that then. If you need mmio dumps, go for intel_reg in intel-gpu-tools [1]. It tries hard to do the right thing, but it's generally not a safe operation. [1] http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/