I tested with kernel 3.5.7-03050708-generic and got one hangup so far:
[ 4398.561288] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung [ 4398.561294] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state [ 4398.572743] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
I tested with kernel 3.5.7-03050708- generic and got one hangup so far:
[ 4398.561288] [drm:i915_ hangcheck_ hung] *ERROR* Hangcheck timer elapsed... GPU hung dri/0/i915_ error_state
[ 4398.561294] [drm] capturing error event; look for more information in /debug/
[ 4398.572743] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off