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[Bug 946899] Re: [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung

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I can consistently reproduce the "*ERROR* Hangcheck timer elapsed... GPU hung" message in the following conditions: using the new Google Maps interface with Chrome and WebGL hardware acceleration enabled.
After a few seconds navigating in the Maps interface, the browser crashes and Unity freezes. I'm able to restore Unity by switching to the terminal, killing Compiz and switching back again.
After restoring Unity, it seems that Chrome automatically disables hardware acceleration. You can see, attached, the results of about:gpu before and after the crash. After this point, Maps navigation does not crash the browser. However, by restarting the browser, hardware acceleration is back again, and I'm able to reproduce the same behavior.

** Attachment added: "gpu.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/946899/+attachment/3893775/+files/gpu.tar.gz

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https://bugs.launchpad.net/bugs/946899

Title:
  [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU
  hung

Status in The Linux Kernel:
  Incomplete
Status in The Linux Mint Distribution:
  Confirmed
Status in “linux” package in Ubuntu:
  Triaged
Status in “linux” package in Fedora:
  Unknown

Bug description:
  Since upgrading to 12.04 beta, I've seen this happen twice. The
  symptoms are:

  - The screen freezes
  - The backlight turns off

  At that point I have to reboot to get my display back. In syslog, i
  see:

  
  Mar  4 23:09:18 perseus kernel: [ 3751.612064] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
  Mar  4 23:09:18 perseus kernel: [ 3751.612076] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
  Mar  4 23:09:18 perseus kernel: [ 3751.613658] [drm:i915_wait_request] *ERROR* i915_wait_request returns -11 (awaiting 114040 at 114004, next 114118)
  Mar  4 23:09:18 perseus kernel: [ 3751.637049] [drm:init_ring_common] *ERROR* render ring initialization failed ctl 00000000 head 00000000 tail 00000000 start 00000000

  followed by a lot of things like:

  
  Mar  4 23:09:18 perseus kernel: [ 3751.700662] WARNING: at /build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:793 intel_enable_pipe+0x14a/0x150 [i915]()
  Mar  4 23:09:18 perseus kernel: [ 3751.700667] Hardware name: 6465CTO
  Mar  4 23:09:18 perseus kernel: [ 3751.700670] PLL state assertion failure (expected on, current off)

  Mar  4 23:09:18 perseus kernel: [ 3751.812158] WARNING: at /build/buildd/linux-3.2.0/drivers/gpu/drm/i915/intel_display.c:930 assert_pipe+0x75/0x80 [i915]()
  Mar  4 23:09:18 perseus kernel: [ 3751.812165] Hardware name: 6465CTO
  Mar  4 23:09:18 perseus kernel: [ 3751.812170] pipe B assertion failure (expected on, current off)

  then:

  
  Mar  4 23:09:19 perseus kernel: [ 3753.044086] [drm:intel_lvds_enable] *ERROR* timed out waiting for panel to power on
  Mar  4 23:09:20 perseus kernel: [ 3753.671451] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
  Mar  4 23:09:20 perseus kernel: [ 3753.684603] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
  Mar  4 23:09:20 perseus kernel: [ 3753.704594] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
  Mar  4 23:09:20 perseus kernel: [ 3753.724594] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
  Mar  4 23:09:20 perseus kernel: [ 3753.744595] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
  Mar  4 23:09:20 perseus kernel: [ 3753.764606] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
  Mar  4 23:09:20 perseus kernel: [ 3753.784607] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
  Mar  4 23:09:20 perseus kernel: [ 3753.804618] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling
  Mar  4 23:09:20 perseus kernel: [ 3753.824606] [drm:i915_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-17-generic 3.2.0-17.27
  ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
  Uname: Linux 3.2.0-17-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.94-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mdz        2458 F.... pulseaudio
   /dev/snd/controlC1:  mdz        2458 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfe020000 irq 49'
     Mixer name	: 'Analog Devices AD1984'
     Components	: 'HDA:11d41984,17aa20bb,00100400'
     Controls      : 31
     Simple ctrls  : 19
  Card1.Amixer.info:
   Card hw:1 'Q9000'/'Logitech, Inc. QuickCam Pro 9000 at usb-0000:00:1a.7-3, high speed'
     Mixer name	: 'USB Mixer'
     Components	: 'USB046d:0990'
     Controls      : 2
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'Mic',0
     Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
     Capture channels: Mono
     Limits: Capture 0 - 3072
     Mono: Capture 0 [0%] [18.00dB] [off]
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7KHT24WW-1.08'
     Mixer name	: 'ThinkPad EC 7KHT24WW-1.08'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Sun Mar  4 23:12:05 2012
  HibernationDevice: RESUME=UUID=bc555036-0252-42e8-804b-b34dc22bbcd4
  MachineType: LENOVO 6465CTO
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   TERM=xterm
   LC_COLLATE=C
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/zsh
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-17-generic root=UUID=305dde78-d20a-4248-aaf4-09447b7c5791 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-17-generic N/A
   linux-backports-modules-3.2.0-17-generic  N/A
   linux-firmware                            1.71
  SourcePackage: linux
  UpgradeStatus: Upgraded to precise on 2012-03-04 (0 days ago)
  WpaSupplicantLog:
   
  dmi.bios.date: 01/21/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7LETB0WW (2.10 )
  dmi.board.name: 6465CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr7LETB0WW(2.10):bd01/21/2008:svnLENOVO:pn6465CTO:pvrThinkPadT61:rvnLENOVO:rn6465CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 6465CTO
  dmi.product.version: ThinkPad T61
  dmi.sys.vendor: LENOVO

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