same issue here
[ 1941.972506] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung [ 1941.972511] [drm] capturing error event; look for more information in /debug/dri/1/i915_error_state [ 1941.983583] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
Linux lenore 3.5.0-26-generic #42-Ubuntu SMP Fri Mar 8 23:18:20 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Thinkpad T520 / NVIDIA Quadro NVS 4200M
same issue here
[ 1941.972506] [drm:i915_ hangcheck_ hung] *ERROR* Hangcheck timer elapsed... GPU hung dri/1/i915_ error_state
[ 1941.972511] [drm] capturing error event; look for more information in /debug/
[ 1941.983583] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
Linux lenore 3.5.0-26-generic #42-Ubuntu SMP Fri Mar 8 23:18:20 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Thinkpad T520 / NVIDIA Quadro NVS 4200M