This does sound similar to the vblank sync bug, but the symptoms differ,
and we have already pulled in the patch for the vblank sync bug:
120_fix_dri2_vblank_syncing_segfault.patch (commit
b8e360bf2b77d28559d15a7c0f9c766848eb6ced)

-- 
[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
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xf86-video-intel.

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