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[maor <maor.gm@xxxxxxxxx>]

This bug causing the display server the hang, the only way to recover is to reboot the system.
GPU: Intel GM45 

These are the kernel message when problem occurred:

[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
render error detected, EIR: 0x00000000
[drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 1398676 at 1398642)
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
[18701.420092] render error detected, EIR: 0x00000000
[18701.420113] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 1398678 at 1398642)
[18701.628454] iwlagn 0000:03:00.0: iwl_tx_agg_start on ra = 00:22:3f:8d:a1:42 tid = 0
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
render error detected, EIR: 0x00000000
[drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 1398681 at 1398642)
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
render error detected, EIR: 0x00000000

-- 
[965gm] drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 150858 at 150857)
https://bugs.launchpad.net/bugs/601530
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