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[Benj_C <601530@xxxxxxxxxxxxxxxxxx>]

Same here on a Dell Inspiron 710m with driver i915 and Linux kernel 2.6.32-33-generic. 
Sometimes, and for a reason that I haven't identified yet, if I open Thunderbird or Firefox I get a black screen then go back to the log in screen; I have to reboot to get rid of that malfunctioning. It happens at least once a week and started within the last 7 days (I would say).

kern.log:
[  406.277038] ipw2200: Firmware error detected.  Restarting.
[  504.616250] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
[  504.616269] render error detected, EIR: 0x00000000
[  504.616304] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 15459 at 15442)
[  746.270794] ipw2200: Firmware error detected.  Restarting.

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https://bugs.launchpad.net/bugs/601530

Title:
  [965gm] drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns
  -5 (awaiting 150858 at 150857)

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