I haven't gotten one of these in a long time..

  [89045.616347] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
  [89045.616352] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
  [89045.621818] [drm:i915_wait_request] *ERROR* i915_wait_request returns -11 (awaiting 3692400 at 3692395, next 3692401)

Any ideas? Full dmesg and the i915_error_state file content in the 
attachement..

X is hung, but I can at least switch VT's and send this from a text 
terminal..

                Linus