Same problem on Ubuntu 13.04
[ 837.379197] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung [ 837.379203] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
crash@Dell-Latitude-E6520:~$ uname -a Linux Dell-Latitude-E6520 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:16:28 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Same problem on Ubuntu 13.04
[ 837.379197] [drm:i915_ hangcheck_ hung] *ERROR* Hangcheck timer elapsed... GPU hung dri/0/i915_ error_state
[ 837.379203] [drm] capturing error event; look for more information in /debug/
crash@Dell- Latitude- E6520:~ $ uname -a
Linux Dell-Latitude-E6520 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:16:28 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux