Same problem: display freezes for few seconds since a few days.
Ubuntu 12.10
Mar 22 18:22:02 bhnbu kernel: [28761.486703] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
Linux bhnbu 3.5.0-26-generic #42-Ubuntu SMP Fri Mar 8 23:18:20 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Same problem: display freezes for few seconds since a few days.
Ubuntu 12.10
Mar 22 18:22:02 bhnbu kernel: [28761.486703] [drm:i915_ hangcheck_ hung] *ERROR* Hangcheck timer elapsed... GPU hung
Linux bhnbu 3.5.0-26-generic #42-Ubuntu SMP Fri Mar 8 23:18:20 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux