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[David Huggins-Daines <dhdaines@xxxxxxxxx>]

This reliably happens to me when dragging a firefox window from one
monitor to another in 13.04.  As above, unity --replace fails and I have
to reboot the computer to make it work again.  It seems to have started
just a week or two ago.

Hardware/software info:

Dell Latitude E6410
00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02)

ii  libgl1-mesa-dri:amd64                     9.1.7-1ubuntu2                             amd64        free implementation of the OpenGL API -- DRI modules
ii  xserver-xorg-video-intel                  2:2.21.6-0ubuntu4.3                        amd64        X.Org X server -- Intel i8xx, i9xx display driver

In dmesg, I see:

[  280.763186] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[  280.763195] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
[  282.750114] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[  282.750272] [drm:i915_reset] *ERROR* GPU hanging too fast, declaring wedged!
[  282.750275] [drm:i915_reset] *ERROR* Failed to reset chip.

I'm not sure how to see /debug/dri/0/i915_error_state - is there a
/debug filesystem I can mount or something?

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https://bugs.launchpad.net/bugs/932900

Title:
  Unity freeze, crashes when trying to restart - GPU lockup with IPEHR:
  0x7a000002

Status in “mesa” package in Ubuntu:
  Confirmed
Status in “unity” package in Ubuntu:
  Invalid

Bug description:
  Unity froze on my when initiating the workspace switcher (which had
  been working previously in the same session).  I switched to
  ctrl+alt+F1 to get to a command prompt, ran unity --replace, but that
  kept crashing.

  Output from unity --replace:

  unity-panel-service: no process found
  Checking if settings need to be migrated ...no
  Checking if internal files need to be migrated ...no
  Backend     : gconf
  Integration : true
  Profile     : unity
  Adding plugins
  Initializing core options...done
  compiz (core) - Error: Couldn't load plugin 'bailer'
  compiz (core) - Error: Couldn't load plugin 'detection'
  Initializing composite options...done
  Initializing opengl options...done
  Initializing decor options...done
  Initializing vpswitch options...done
  Initializing move options...done
  Initializing place options...done
  Initializing grid options...done
  Initializing annotate options...done
  Initializing snap options...done
  Initializing obs options...done
  Initializing session options...done
  Initializing mousepoll options...done
  Initializing resize options...done
  Initializing animation options...done
  Initializing workarounds options...done
  Initializing gnomecompat options...done
  compiz (expo) - Warn: failed to bind image to texture
  Initializing expo options...done
  Initializing ezoom options...done
  Initializing wall options...done
  Initializing fade options...done
  Initializing scale options...done

  Screen geometry changed:
     0x0x1280x800

  intel_do_flush_locked failed: Input/output error

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: unity 5.2.0-0ubuntu4
  ProcVersionSignature: Ubuntu 3.2.0-16.25-generic-pae 3.2.6
  Uname: Linux 3.2.0-16-generic-pae i686
  NonfreeKernelModules: wl
  .tmp.unity.support.test.0:
   
  ApportVersion: 1.91-0ubuntu1
  Architecture: i386
  CompizPlugins: [core,bailer,detection,composite,opengl,decor,vpswitch,compiztoolbox,move,place,grid,annotate,snap,obs,session,mousepoll,resize,regex,imgpng,animation,workarounds,gnomecompat,expo,ezoom,wall,fade,scale,unityshell,scaleaddon,scalefilter]
  CompositorRunning: compiz
  Date: Wed Feb 15 12:06:36 2012
  DistUpgraded: Log time: 2012-01-23 11:49:43.962217
  DistroCodename: precise
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) [8086:2a02] (rev 0c) (prog-if 00 [VGA controller])
     Subsystem: Dell Latitude D630 [1028:01f9]
     Subsystem: Dell Device [1028:01f9]
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MachineType: Dell Inc. Latitude D630
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-16-generic-pae root=UUID=cdf53458-c5c8-4260-9504-6da8a8a22fd1 ro quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: Upgraded to precise on 2012-01-23 (22 days ago)
  dmi.bios.date: 06/20/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 0KU184
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd06/20/2008:svnDellInc.:pnLatitudeD630:pvr:rvnDellInc.:rn0KU184:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude D630
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.7.0~bzr2995-0ubuntu1
  version.libdrm2: libdrm2 2.4.30-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0~rc2-0ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0~rc2-0ubuntu5
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901+git20120126-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

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