Public bug reported:

Occasionally my screen gets black. The machine is still alive, can login
via ssh.


journalctl -k -b-2 | grep drm
Jul 26 10:22:34  kernel: [drm] Initialized drm 1.1.0 20060810
Jul 26 10:22:34  kernel: [drm] Memory usable by graphics device = 2048M
Jul 26 10:22:34  kernel: fb: switching to inteldrmfb from VESA VGA
Jul 26 10:22:34  kernel: [drm] Replacing VGA console driver
Jul 26 10:22:34  kernel: [drm] Supports vblank timestamp caching Rev 2 
(21.10.2013).
Jul 26 10:22:34  kernel: [drm] Driver supports precise vblank timestamp query.
Jul 26 10:22:34  kernel: [drm:intel_opregion_init [i915]] *ERROR* No ACPI video 
bus found
Jul 26 10:22:34  kernel: [drm] Initialized i915 1.6.0 20151010 for 0000:00:02.0 
on minor 0
Jul 26 10:22:34  kernel: [drm] GMBUS [i915 gmbus vga] timed out, falling back 
to bit banging on pin 2
Jul 26 10:22:34  kernel: fbcon: inteldrmfb (fb0) is primary device
Jul 26 10:22:34  kernel: i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
Jul 27 16:25:30  kernel: [drm] stuck on render ring
Jul 27 16:25:30  kernel: [drm] GPU HANG: ecode 6:0:0x85eefffc, in 
chromium-browse [18427], reason: Ring hung, action: reset
Jul 27 16:25:30  kernel: [drm] GPU hangs can indicate a bug anywhere in the 
entire gfx stack, including userspace.
Jul 27 16:25:30  kernel: [drm] Please file a _new_ bug report on 
bugs.freedesktop.org against DRI -> DRM/Intel
Jul 27 16:25:30  kernel: [drm] drm/i915 developers can then reassign to the 
right component if it's not a kernel issue.
Jul 27 16:25:30  kernel: [drm] The gpu crash dump is required to analyze gpu 
hangs, so please always attach it.
Jul 27 16:25:30  kernel: [drm] GPU crash dump saved to 
/sys/class/drm/card0/error
Jul 27 16:25:30  kernel: drm/i915: Resetting chip after gpu hang
Jul 27 16:36:14  kernel: [drm] stuck on render ring
Jul 27 16:36:14  kernel: [drm] GPU HANG: ecode 6:0:0x85eefffc, in 
chromium-browse [26940], reason: Ring hung, action: reset
Jul 27 16:36:14  kernel: drm/i915: Resetting chip after gpu hang
Jul 27 17:28:30  kernel: [drm] stuck on render ring
Jul 27 17:28:30  kernel: [drm] GPU HANG: ecode 6:0:0x85eefffc, in 
chromium-browse [27028], reason: Ring hung, action: reset
Jul 27 17:28:30  kernel: drm/i915: Resetting chip after gpu hang
Jul 27 18:55:17  kernel: [drm] stuck on render ring
Jul 27 18:55:17  kernel: [drm] GPU HANG: ecode 6:0:0x85eecffc, in plasmashell 
[27304], reason: Ring hung, action: reset
Jul 27 18:55:17  kernel: drm/i915: Resetting chip after gpu hang
Jul 27 18:55:23  kernel: [drm] stuck on render ring
Jul 27 18:55:23  kernel: [drm] GPU HANG: ecode 6:0:0x85eeeffc, in plasmashell 
[27304], reason: Ring hung, action: reset
Jul 27 18:55:23  kernel: drm/i915: Resetting chip after gpu hang
Jul 27 18:55:29  kernel: [drm] stuck on render ring
Jul 27 18:55:29  kernel: [drm] GPU HANG: ecode 6:0:0x85eefffc, in 
chromium-browse [27590], reason: Ring hung, action: reset
Jul 27 18:55:29  kernel: drm/i915: Resetting chip after gpu hang
Jul 28 15:24:23  kernel: [drm] stuck on render ring
Jul 28 15:24:23  kernel: [drm] GPU HANG: ecode 6:0:0xbc17ffff, in 
chromium-browse [29032], reason: Ring hung, action: reset
Jul 28 15:24:23  kernel: drm/i915: Resetting chip after gpu hang
Jul 28 18:04:52  kernel: [drm:intel_dp_link_training_clock_recovery [i915]] 
*ERROR* failed to enable link training
Jul 28 18:04:52  kernel: [drm:intel_dp_link_training_channel_equalization 
[i915]] *ERROR* failed to start channel equalization


The error Jul 26 10:22:34  kernel: [drm:intel_opregion_init [i915]]
*ERROR* No ACPI video bus found happens at every boot

The last two errors coincide with the times the screen gets blank.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: KDE
Date: Fri Jul 29 08:45:47 2016
DistUpgraded: 2016-04-26 11:22:19,544 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
DistroCodename: xenial
DistroVariant: kubuntu
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Intel Corporation 2nd Generation Core Processor Family Integrated 
Graphics Controller [8086:2001]
InstallationDate: Installed on 2016-04-12 (107 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic 
root=UUID=f93cc9f4-e422-49f0-b9d8-5db514ce0a72 ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to xenial on 2016-04-26 (93 days ago)
dmi.bios.date: 10/07/2011
dmi.bios.vendor: Intel Corp.
dmi.bios.version: BLH6710H.86A.0132.2011.1007.1505
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: DH67GD
dmi.board.vendor: Intel Corporation
dmi.board.version: AAG10206-206
dmi.chassis.type: 3
dmi.modalias: 
dmi:bvnIntelCorp.:bvrBLH6710H.86A.0132.2011.1007.1505:bd10/07/2011:svn:pn:pvr:rvnIntelCorporation:rnDH67GD:rvrAAG10206-206:cvn:ct3:cvr:
version.compiz: compiz 1:0.9.12.2+16.04.20160714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Fri Jul 29 08:06:24 2016
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        Logitech Logitech USB Keyboard KEYBOARD, id 8
 input        Logitech USB Optical Mouse MOUSE, id 9
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.18.3-1ubuntu2.2

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug kubuntu xenial

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1607774

Title:
  i915 kernel module stops working occasionally

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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1607774/+subscriptions

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