Public bug reported:

ubuntu 12.10 64 bit
a couple of minutes after logging into unity session i have this bug (text from 
dmesg):
[ 2592.718947] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU 
hung
[ 2592.718951] [drm] capturing error event; look for more information in 
/debug/dri/0/i915_error_state
[ 2592.722119] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-26-generic 3.5.0-26.42
ProcVersionSignature: Ubuntu 3.5.0-26.42-generic 3.5.7.6
Uname: Linux 3.5.0-26-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  jumper     1946 F.... pulseaudio
CRDA:
 country GB:
        (2402 - 2482 @ 40), (N/A, 20)
        (5170 - 5250 @ 40), (N/A, 20)
        (5250 - 5330 @ 40), (N/A, 20), DFS
        (5490 - 5710 @ 40), (N/A, 27), DFS
Date: Fri Mar 29 23:29:12 2013
HibernationDevice: RESUME=UUID=ba603f6d-230a-4479-a307-bc030929dabb
InstallationDate: Installed on 2013-01-18 (70 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: LENOVO 2324HF4
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-26-generic 
root=UUID=e189f839-8390-44b5-abff-dd8b750a7a20 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-26-generic N/A
 linux-backports-modules-3.5.0-26-generic  N/A
 linux-firmware                            1.95
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/11/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: G2ET82WW (2.02 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2324HF4
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvrG2ET82WW(2.02):bd09/11/2012:svnLENOVO:pn2324HF4:pvrThinkPadX230:rvnLENOVO:rn2324HF4:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2324HF4
dmi.product.version: ThinkPad X230
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug quantal running-unity

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https://bugs.launchpad.net/bugs/1162007

Title:
  [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung

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