Re: [REGRESSION] Re: i915 driver crashes on T540p if docking station attached

Theodore Ts'o
2015-08-03T16:25:19Z

On Mon, Aug 03, 2015 at 05:27:29PM +0200, Daniel Vetter wrote:
>
> Ok I updated fixes-stuff with just 2 patches which seem to be enough to
> fix it. Plus a patch to convert Linus' hack into something we can keep
> plus a drive-by WARNING fix in mst that got in the way for me.
>
> Seems to work here in getting rid of the Oops. If this tests out for you
> too I'll send a pull to Linus.

I've just tried pulling in your updated fixes-stuff, and it avoids the
oops and allows external the monitor to work correctly. However, I'm
still seeing a large number of drm/i915 related warning messages and
other kernel kvetching.

Thanks!!

- Ted

[ 4.084198] [drm] Initialized drm 1.1.0 20060810
[ 4.129576] [drm] Memory usable by graphics device = 2048M
[ 4.129616] [drm] Replacing VGA console driver
[ 4.130315] Console: switching to colour dummy device 80x25
[ 4.145332] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 4.145334] [drm] Driver supports precise vblank timestamp query.
[ 4.146184] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 4.163778] usbcore: registered new interface driver btusb
[ 4.170719] ------------[ cut here ]------------
[ 4.170749] WARNING: CPU: 0 PID: 463 at /usr/projects/linux/linux/drivers/gpu/drm/i915/intel_pm.c:2339 ilk_update_wm+0x71a/0xb27 [i915]()
[ 4.170751] WARN_ON(!r->enable)
[ 4.170752] Modules linked in:
[ 4.170754] btusb btrtl btbcm btintel iwlmvm(+) bluetooth mac80211 iwlwifi snd_hda_intel i915(+) drm_kms_helper snd_hda_codec cfg80211 drm snd_hwdep lpc_ich snd_hda_core intel_gtt thinkpad_acpi tpm_tis nvram tpm intel_smartconnect uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core sch_fq_codel kvm_intel kvm ecryptfs parport_pc ppdev lp parport autofs4 btrfs xor hid_generic usbhid hid raid6_pq microcode rtsx_pci_sdmmc ehci_pci e1000e rtsx_pci ehci_hcd xhci_pci ptp mfd_core pps_core xhci_hcd
[ 4.170805] CPU: 0 PID: 463 Comm: systemd-udevd Not tainted 4.2.0-rc5-14194-g130583b #18
[ 4.170807] Hardware name: LENOVO 20BECTO1WW/20BECTO1WW, BIOS GMET59WW (2.07 ) 02/12/2014
[ 4.170809] 0000000000000009 ffff880403f0f4c8 ffffffff8161aaee 0000000000000006
[ 4.170814] ffff880403f0f518 ffff880403f0f508 ffffffff8107e5f0 0000000000000006
[ 4.170818] ffffffffc05ade43 ffff8800c8b70000 ffff8800c7f16000 ffff880405fb48b8
[ 4.170823] Call Trace:
[ 4.170829] [<ffffffff8161aaee>] dump_stack+0x4c/0x65
[ 4.170833] [<ffffffff8107e5f0>] warn_slowpath_common+0xa1/0xbb
[ 4.170856] [<ffffffffc05ade43>] ? ilk_update_wm+0x71a/0xb27 [i915]
[ 4.170859] [<ffffffff8107e650>] warn_slowpath_fmt+0x46/0x48
[ 4.170879] [<ffffffffc05abb1e>] ? ilk_compute_wm_maximums+0x43/0xa2 [i915]
[ 4.170899] [<ffffffffc05ade43>] ilk_update_wm+0x71a/0xb27 [i915]
[ 4.170921] [<ffffffffc05afb2b>] intel_update_watermarks+0x1e/0x20 [i915]
[ 4.170957] [<ffffffffc05ff8d4>] haswell_crtc_disable+0x270/0x2ae [i915]
[ 4.170989] [<ffffffffc060199d>] intel_crtc_control+0xa0/0xe1 [i915]
[ 4.171020] [<ffffffffc0601a2b>] intel_crtc_update_dpms+0x4d/0x5d [i915]
[ 4.171052] [<ffffffffc0607dd9>] intel_modeset_setup_hw_state+0x7b0/0xa90 [i915]
[ 4.171081] [<ffffffffc05ec6de>] ? hsw_write64+0xcd/0xcd [i915]
[ 4.171113] [<ffffffffc060ab44>] ? ilk_fbc_disable+0x29/0x69 [i915]
[ 4.171142] [<ffffffffc0609512>] intel_modeset_init+0x130d/0x14e3 [i915]
[ 4.171179] [<ffffffffc0636962>] i915_driver_load+0xf05/0x1139 [i915]
[ 4.171183] [<ffffffff810ba787>] ? mark_held_locks+0x56/0x6c
[ 4.171186] [<ffffffff81620c06>] ? _raw_spin_unlock_irqrestore+0x3f/0x4d
[ 4.171189] [<ffffffff810ba90e>] ? trace_hardirqs_on_caller+0x171/0x18d
[ 4.171204] [<ffffffffc042cf19>] drm_dev_register+0x84/0xfd [drm]
[ 4.171215] [<ffffffffc042f77e>] drm_get_pci_dev+0x102/0x1bc [drm]
[ 4.171237] [<ffffffffc05a61e2>] i915_pci_probe+0x4f/0x51 [i915]
[ 4.171240] [<ffffffff81333c33>] pci_device_probe+0x74/0xd6
[ 4.171245] [<ffffffff813d4b8e>] ? driver_probe_device+0x387/0x387
[ 4.171248] [<ffffffff813d4966>] driver_probe_device+0x15f/0x387
[ 4.171250] [<ffffffff813d4b8e>] ? driver_probe_device+0x387/0x387
[ 4.171252] [<ffffffff813d4be1>] __driver_attach+0x53/0x74
[ 4.171255] [<ffffffff813d2c00>] bus_for_each_dev+0x6f/0x89
[ 4.171257] [<ffffffff813d4350>] driver_attach+0x1e/0x20
[ 4.171260] [<ffffffff813d3f93>] bus_add_driver+0x140/0x238
[ 4.171263] [<ffffffff813d5538>] driver_register+0x8f/0xcc
[ 4.171266] [<ffffffff81332d41>] __pci_register_driver+0x5e/0x62
[ 4.171268] [<ffffffffc069c000>] ? 0xffffffffc069c000
[ 4.171278] [<ffffffffc042f890>] drm_pci_init+0x58/0xda [drm]
[ 4.171281] [<ffffffffc069c000>] ? 0xffffffffc069c000
[ 4.171301] [<ffffffffc069c0a0>] i915_init+0xa0/0xa8 [i915]
[ 4.171303] [<ffffffffc069c000>] ? 0xffffffffc069c000
[ 4.171307] [<ffffffff810003c7>] do_one_initcall+0x19a/0x1af
[ 4.171310] [<ffffffff81619d1d>] ? do_init_module+0x28/0x1e3
[ 4.171313] [<ffffffff81199429>] ? kmem_cache_alloc_trace+0xba/0xcc
[ 4.171315] [<ffffffff81619d55>] do_init_module+0x60/0x1e3
[ 4.171319] [<ffffffff810f0acd>] load_module+0x1c42/0x2059
[ 4.171324] [<ffffffff810f10b8>] SyS_finit_module+0x85/0x92
[ 4.171327] [<ffffffff8162145b>] entry_SYSCALL_64_fastpath+0x16/0x73
[ 4.171329] ---[ end trace 7eb514b89de5fc4a ]---
[ 4.171331] ------------[ cut here ]------------
[ 4.171354] WARNING: CPU: 0 PID: 463 at /usr/projects/linux/linux/drivers/gpu/drm/i915/intel_pm.c:2339 ilk_update_wm+0x71a/0xb27 [i915]()
[ 4.171355] WARN_ON(!r->enable)
[ 4.171357] Modules linked in:
[ 4.171358] btusb btrtl btbcm btintel iwlmvm(+) bluetooth mac80211 iwlwifi snd_hda_intel i915(+) drm_kms_helper snd_hda_codec cfg80211 drm snd_hwdep lpc_ich snd_hda_core intel_gtt thinkpad_acpi tpm_tis nvram tpm intel_smartconnect uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core sch_fq_codel kvm_intel kvm ecryptfs parport_pc ppdev lp parport autofs4 btrfs xor hid_generic usbhid hid raid6_pq microcode rtsx_pci_sdmmc ehci_pci e1000e rtsx_pci ehci_hcd xhci_pci ptp mfd_core pps_core xhci_hcd
[ 4.171404] CPU: 0 PID: 463 Comm: systemd-udevd Tainted: G W 4.2.0-rc5-14194-g130583b #18
[ 4.171406] Hardware name: LENOVO 20BECTO1WW/20BECTO1WW, BIOS GMET59WW (2.07 ) 02/12/2014
[ 4.171408] 0000000000000009 ffff880403f0f4c8 ffffffff8161aaee 0000000000000006
[ 4.171412] ffff880403f0f518 ffff880403f0f508 ffffffff8107e5f0 0000000000000006
[ 4.171417] ffffffffc05ade43 ffff8800c8b70000 ffff8800c7f15000 ffff880405fb48b8
[ 4.171421] Call Trace:
[ 4.171424] [<ffffffff8161aaee>] dump_stack+0x4c/0x65
[ 4.171427] [<ffffffff8107e5f0>] warn_slowpath_common+0xa1/0xbb
[ 4.171449] [<ffffffffc05ade43>] ? ilk_update_wm+0x71a/0xb27 [i915]
[ 4.171452] [<ffffffff8107e650>] warn_slowpath_fmt+0x46/0x48
[ 4.171472] [<ffffffffc05abb1e>] ? ilk_compute_wm_maximums+0x43/0xa2 [i915]
[ 4.171491] [<ffffffffc05ade43>] ilk_update_wm+0x71a/0xb27 [i915]
[ 4.171513] [<ffffffffc05afb2b>] intel_update_watermarks+0x1e/0x20 [i915]
[ 4.171546] [<ffffffffc05ff8d4>] haswell_crtc_disable+0x270/0x2ae [i915]
[ 4.171579] [<ffffffffc060199d>] intel_crtc_control+0xa0/0xe1 [i915]
[ 4.171610] [<ffffffffc0601a2b>] intel_crtc_update_dpms+0x4d/0x5d [i915]
[ 4.171641] [<ffffffffc0607dd9>] intel_modeset_setup_hw_state+0x7b0/0xa90 [i915]
[ 4.171671] [<ffffffffc05ec6de>] ? hsw_write64+0xcd/0xcd [i915]
[ 4.171702] [<ffffffffc060ab44>] ? ilk_fbc_disable+0x29/0x69 [i915]
[ 4.171733] [<ffffffffc0609512>] intel_modeset_init+0x130d/0x14e3 [i915]
[ 4.171770] [<ffffffffc0636962>] i915_driver_load+0xf05/0x1139 [i915]
[ 4.171773] [<ffffffff810ba787>] ? mark_held_locks+0x56/0x6c
[ 4.171776] [<ffffffff81620c06>] ? _raw_spin_unlock_irqrestore+0x3f/0x4d
[ 4.171779] [<ffffffff810ba90e>] ? trace_hardirqs_on_caller+0x171/0x18d
[ 4.171791] [<ffffffffc042cf19>] drm_dev_register+0x84/0xfd [drm]
[ 4.171802] [<ffffffffc042f77e>] drm_get_pci_dev+0x102/0x1bc [drm]
[ 4.171825] [<ffffffffc05a61e2>] i915_pci_probe+0x4f/0x51 [i915]
[ 4.171828] [<ffffffff81333c33>] pci_device_probe+0x74/0xd6
[ 4.171831] [<ffffffff813d4b8e>] ? driver_probe_device+0x387/0x387
[ 4.171833] [<ffffffff813d4966>] driver_probe_device+0x15f/0x387
[ 4.171836] [<ffffffff813d4b8e>] ? driver_probe_device+0x387/0x387
[ 4.171838] [<ffffffff813d4be1>] __driver_attach+0x53/0x74
[ 4.171841] [<ffffffff813d2c00>] bus_for_each_dev+0x6f/0x89
[ 4.171844] [<ffffffff813d4350>] driver_attach+0x1e/0x20
[ 4.171846] [<ffffffff813d3f93>] bus_add_driver+0x140/0x238
[ 4.171849] [<ffffffff813d5538>] driver_register+0x8f/0xcc
[ 4.171852] [<ffffffff81332d41>] __pci_register_driver+0x5e/0x62
[ 4.171854] [<ffffffffc069c000>] ? 0xffffffffc069c000
[ 4.171866] [<ffffffffc042f890>] drm_pci_init+0x58/0xda [drm]
[ 4.171868] [<ffffffffc069c000>] ? 0xffffffffc069c000
[ 4.171890] [<ffffffffc069c0a0>] i915_init+0xa0/0xa8 [i915]
[ 4.171893] [<ffffffffc069c000>] ? 0xffffffffc069c000
[ 4.171896] [<ffffffff810003c7>] do_one_initcall+0x19a/0x1af
[ 4.171898] [<ffffffff81619d1d>] ? do_init_module+0x28/0x1e3
[ 4.171901] [<ffffffff81199429>] ? kmem_cache_alloc_trace+0xba/0xcc
[ 4.171904] [<ffffffff81619d55>] do_init_module+0x60/0x1e3
[ 4.171907] [<ffffffff810f0acd>] load_module+0x1c42/0x2059
[ 4.171911] [<ffffffff810f10b8>] SyS_finit_module+0x85/0x92
[ 4.171914] [<ffffffff8162145b>] entry_SYSCALL_64_fastpath+0x16/0x73
[ 4.171916] ---[ end trace 7eb514b89de5fc4b ]---
[ 4.176978] Bluetooth: hci0: read Intel version: 370710018002030d48
[ 4.176981] Bluetooth: hci0: Intel device is already patched. patch num: 48

[ 4.181839] ======================================================
[ 4.181844] [ INFO: possible circular locking dependency detected ]
[ 4.181849] 4.2.0-rc5-14194-g130583b #18 Tainted: G W
[ 4.181854] -------------------------------------------------------
[ 4.181859] systemd-udevd/463 is trying to acquire lock:
[ 4.181864] (init_mutex){+.+.+.}, at: [<ffffffff8138b4e0>] acpi_video_get_backlight_type+0x17/0x164
[ 4.181878]
but task is already holding lock:
[ 4.181883] (&(&backlight_notifier)->rwsem){++++..}, at: [<ffffffff8109a7cc>] __blocking_notifier_call_chain+0x37/0x69
[ 4.181895]
which lock already depends on the new lock.

[ 4.181902]
the existing dependency chain (in reverse order) is:
[ 4.181912]
-> #1 (&(&backlight_notifier)->rwsem){++++..}:
[ 4.181923] [<ffffffff810bbe7a>] lock_acquire+0x104/0x18b
[ 4.181932] [<ffffffff8161f5ab>] down_write+0x46/0x8a
[ 4.181942] [<ffffffff8109a6c3>] blocking_notifier_chain_register+0x36/0x57
[ 4.181953] [<ffffffff8134ecae>] backlight_register_notifier+0x18/0x1a
[ 4.181962] [<ffffffff8138b5c3>] acpi_video_get_backlight_type+0xfa/0x164
[ 4.181973] [<ffffffffc03d2e45>] 0xffffffffc03d2e45
[ 4.181981] [<ffffffffc03d38a8>] 0xffffffffc03d38a8
[ 4.181988] [<ffffffff810003c7>] do_one_initcall+0x19a/0x1af
[ 4.181997] [<ffffffff81619d55>] do_init_module+0x60/0x1e3
[ 4.182006] [<ffffffff810f0acd>] load_module+0x1c42/0x2059
[ 4.182015] [<ffffffff810f10b8>] SyS_finit_module+0x85/0x92
[ 4.182023] [<ffffffff8162145b>] entry_SYSCALL_64_fastpath+0x16/0x73
[ 4.182031]
-> #0 (init_mutex){+.+.+.}:
[ 4.182042] [<ffffffff810bb7ec>] __lock_acquire+0xc55/0xf54
[ 4.182050] [<ffffffff810bbe7a>] lock_acquire+0x104/0x18b
[ 4.182058] [<ffffffff8161dc0a>] mutex_lock_nested+0x70/0x391
[ 4.182066] [<ffffffff8138b4e0>] acpi_video_get_backlight_type+0x17/0x164
[ 4.182077] [<ffffffff8138b665>] acpi_video_backlight_notify+0x19/0x2f
[ 4.182086] [<ffffffff8109a445>] notifier_call_chain+0x4c/0x71
[ 4.182094] [<ffffffff8109a7e5>] __blocking_notifier_call_chain+0x50/0x69
[ 4.182105] [<ffffffff8109a812>] blocking_notifier_call_chain+0x14/0x16
[ 4.182116] [<ffffffff8134f183>] backlight_device_register+0x1df/0x1f1
[ 4.182125] [<ffffffffc063005e>] intel_backlight_register+0xf0/0x157 [i915]
[ 4.182174] [<ffffffffc0609840>] intel_modeset_gem_init+0x158/0x164 [i915]
[ 4.182214] [<ffffffffc0636979>] i915_driver_load+0xf1c/0x1139 [i915]
[ 4.182253] [<ffffffffc042cf19>] drm_dev_register+0x84/0xfd [drm]
[ 4.182271] [<ffffffffc042f77e>] drm_get_pci_dev+0x102/0x1bc [drm]
[ 4.182287] [<ffffffffc05a61e2>] i915_pci_probe+0x4f/0x51 [i915]
[ 4.182314] [<ffffffff81333c33>] pci_device_probe+0x74/0xd6
[ 4.182322] [<ffffffff813d4966>] driver_probe_device+0x15f/0x387
[ 4.182331] [<ffffffff813d4be1>] __driver_attach+0x53/0x74
[ 4.182339] [<ffffffff813d2c00>] bus_for_each_dev+0x6f/0x89
[ 4.182347] [<ffffffff813d4350>] driver_attach+0x1e/0x20
[ 4.182355] [<ffffffff813d3f93>] bus_add_driver+0x140/0x238
[ 4.182363] [<ffffffff813d5538>] driver_register+0x8f/0xcc
[ 4.182371] [<ffffffff81332d41>] __pci_register_driver+0x5e/0x62
[ 4.182379] [<ffffffffc042f890>] drm_pci_init+0x58/0xda [drm]
[ 4.182396] [<ffffffffc069c0a0>] i915_init+0xa0/0xa8 [i915]
[ 4.182423] [<ffffffff810003c7>] do_one_initcall+0x19a/0x1af
[ 4.182432] [<ffffffff81619d55>] do_init_module+0x60/0x1e3
[ 4.182440] [<ffffffff810f0acd>] load_module+0x1c42/0x2059
[ 4.182448] [<ffffffff810f10b8>] SyS_finit_module+0x85/0x92
[ 4.182456] [<ffffffff8162145b>] entry_SYSCALL_64_fastpath+0x16/0x73
[ 4.182465]
other info that might help us debug this:

[ 4.182477] Possible unsafe locking scenario:

[ 4.182486] CPU0 CPU1
[ 4.182491] ---- ----
[ 4.182497] lock(&(&backlight_notifier)->rwsem);
[ 4.182504] lock(init_mutex);
[ 4.182512] lock(&(&backlight_notifier)->rwsem);
[ 4.182522] lock(init_mutex);
[ 4.182528]
*** DEADLOCK ***

[ 4.182540] 4 locks held by systemd-udevd/463:
[ 4.182546] #0: (&dev->mutex){......}, at: [<ffffffff813d4151>] device_lock+0xf/0x11
[ 4.182560] #1: (&dev->mutex){......}, at: [<ffffffff813d4151>] device_lock+0xf/0x11
[ 4.182574] #2: (drm_global_mutex){+.+.+.}, at: [<ffffffffc042ceb9>] drm_dev_register+0x24/0xfd [drm]
[ 4.182596] #3: (&(&backlight_notifier)->rwsem){++++..}, at: [<ffffffff8109a7cc>] __blocking_notifier_call_chain+0x37/0x69
[ 4.182612]
stack backtrace:
[ 4.182622] CPU: 0 PID: 463 Comm: systemd-udevd Tainted: G W 4.2.0-rc5-14194-g130583b #18
[ 4.182632] Hardware name: LENOVO 20BECTO1WW/20BECTO1WW, BIOS GMET59WW (2.07 ) 02/12/2014
[ 4.182642] ffffffff8280b780 ffff880403f0f5d8 ffffffff8161aaee 0000000000000006
[ 4.182654] ffffffff8280b780 ffff880403f0f628 ffffffff810b9b51 ffffffff82265780
[ 4.182667] ffff880403de0000 0000000000000004 ffff880403de0880 0000000000000004
[ 4.182679] Call Trace:
[ 4.182685] [<ffffffff8161aaee>] dump_stack+0x4c/0x65
[ 4.182693] [<ffffffff810b9b51>] print_circular_bug+0x1f8/0x209
[ 4.182701] [<ffffffff810bb7ec>] __lock_acquire+0xc55/0xf54
[ 4.182710] [<ffffffff810bbe7a>] lock_acquire+0x104/0x18b
[ 4.182717] [<ffffffff8138b4e0>] ? acpi_video_get_backlight_type+0x17/0x164
[ 4.182726] [<ffffffff8161dc0a>] mutex_lock_nested+0x70/0x391
[ 4.182734] [<ffffffff8138b4e0>] ? acpi_video_get_backlight_type+0x17/0x164
[ 4.182742] [<ffffffff8138b4e0>] ? acpi_video_get_backlight_type+0x17/0x164
[ 4.182750] [<ffffffff8138b4e0>] acpi_video_get_backlight_type+0x17/0x164
[ 4.182759] [<ffffffff8138b665>] acpi_video_backlight_notify+0x19/0x2f
[ 4.182766] [<ffffffff8109a445>] notifier_call_chain+0x4c/0x71
[ 4.182774] [<ffffffff8109a7e5>] __blocking_notifier_call_chain+0x50/0x69
[ 4.182782] [<ffffffff8109a812>] blocking_notifier_call_chain+0x14/0x16
[ 4.182790] [<ffffffff8134f183>] backlight_device_register+0x1df/0x1f1
[ 4.182833] [<ffffffffc063005e>] intel_backlight_register+0xf0/0x157 [i915]
[ 4.182872] [<ffffffffc0609840>] intel_modeset_gem_init+0x158/0x164 [i915]
[ 4.182915] [<ffffffffc0636979>] i915_driver_load+0xf1c/0x1139 [i915]
[ 4.182924] [<ffffffff810ba787>] ? mark_held_locks+0x56/0x6c
[ 4.182932] [<ffffffff81620c06>] ? _raw_spin_unlock_irqrestore+0x3f/0x4d
[ 4.182940] [<ffffffff810ba90e>] ? trace_hardirqs_on_caller+0x171/0x18d
[ 4.182956] [<ffffffffc042cf19>] drm_dev_register+0x84/0xfd [drm]
[ 4.182972] [<ffffffffc042f77e>] drm_get_pci_dev+0x102/0x1bc [drm]
[ 4.182998] [<ffffffffc05a61e2>] i915_pci_probe+0x4f/0x51 [i915]
[ 4.183006] [<ffffffff81333c33>] pci_device_probe+0x74/0xd6
[ 4.183014] [<ffffffff813d4b8e>] ? driver_probe_device+0x387/0x387
[ 4.183021] [<ffffffff813d4966>] driver_probe_device+0x15f/0x387
[ 4.183029] [<ffffffff813d4b8e>] ? driver_probe_device+0x387/0x387
[ 4.183036] [<ffffffff813d4be1>] __driver_attach+0x53/0x74
[ 4.183043] [<ffffffff813d2c00>] bus_for_each_dev+0x6f/0x89
[ 4.183050] [<ffffffff813d4350>] driver_attach+0x1e/0x20
[ 4.183058] [<ffffffff813d3f93>] bus_add_driver+0x140/0x238
[ 4.183065] [<ffffffff813d5538>] driver_register+0x8f/0xcc
[ 4.183073] [<ffffffff81332d41>] __pci_register_driver+0x5e/0x62
[ 4.183080] [<ffffffffc069c000>] ? 0xffffffffc069c000
[ 4.183095] [<ffffffffc042f890>] drm_pci_init+0x58/0xda [drm]
[ 4.183102] [<ffffffffc069c000>] ? 0xffffffffc069c000
[ 4.183126] [<ffffffffc069c0a0>] i915_init+0xa0/0xa8 [i915]
[ 4.183132] [<ffffffffc069c000>] ? 0xffffffffc069c000
[ 4.183139] [<ffffffff810003c7>] do_one_initcall+0x19a/0x1af
[ 4.183146] [<ffffffff81619d1d>] ? do_init_module+0x28/0x1e3
[ 4.183153] [<ffffffff81199429>] ? kmem_cache_alloc_trace+0xba/0xcc
[ 4.183161] [<ffffffff81619d55>] do_init_module+0x60/0x1e3
[ 4.183169] [<ffffffff810f0acd>] load_module+0x1c42/0x2059
[ 4.183178] [<ffffffff810f10b8>] SyS_finit_module+0x85/0x92
[ 4.183185] [<ffffffff8162145b>] entry_SYSCALL_64_fastpath+0x16/0x73
[ 4.186598] ACPI: Video Device [VID] (multi-head: yes rom: no post: no)
[ 4.191522] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 4.191536] [drm] Initialized i915 1.6.0 20150522 for 0000:00:02.0 on minor 0
[ 4.191691] i801_smbus 0000:00:1f.3: SMBus using PCI interrupt
[ 4.248792] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[ 4.322899] fbcon: inteldrmfb (fb0) is primary device
[ 5.440946] Console: switching to colour frame buffer device 360x101
[ 5.452747] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 5.452767] i915 0000:00:02.0: registered panic notifier