I have same symptoms on intel DG45ID (g45)... so probably the same bug.
It is easy to reproduce:  start video in full screen, in about 80
minutes xorg will crash.

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[i965] X freeze on karmic after resume from full screen application: 
i915_gem_retire_work_handler() / finish_task_switch()
https://bugs.launchpad.net/bugs/388357
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