crash@Dell-Latitude-E6520:~$ zgrep hung /var/log/syslog*
/var/log/syslog:Jul 12 10:26:27 Dell-Latitude-E6520 kernel: [ 5995.735802] 
[drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
/var/log/syslog.3.gz:Jul  9 11:11:49 Dell-Latitude-E6520 kernel: [ 5495.987596] 
[drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
/var/log/syslog.3.gz:Jul  9 14:04:17 Dell-Latitude-E6520 kernel: [15832.417726] 
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
/var/log/syslog.4.gz:Jul  8 16:33:55 Dell-Latitude-E6520 kernel: [27233.088137] 
[drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
/var/log/syslog.7.gz:Jul  3 12:56:18 Dell-Latitude-E6520 kernel: [34267.232367] 
[drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung

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https://bugs.launchpad.net/bugs/1140716

Title:
  [regression] 3.5.0-26-generic and  3.2.0-39-generic GPU hangs on
  Sandybridge

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