Hi,

When I was using google chrome, laptop screen got frozen for a while.
dmesg had this,

[drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[drm] capturing error event; look for more information 
in/sys/kernel/debug/dri/0/i915_error_state

PFA i915_error_state.gz, as plain file was huge(~2.4M).

-lijo