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

[Theodore Ts'o <tytso@mit.edu>]

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
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