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[Henry Wertz <hwertz@xxxxxxxxxx>]

"Me too", also with a GX260.  dmesg shows streams of errors such as:
[97544.908019] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
[97544.908032] render error detected, EIR: 0x00000000
[97544.908056] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 6540 at 6213)
     when this happens.  I think this is why the "Failed to submit batchbuffer: Input/output error" occurs within XOrg, the GPU indeed is hung.   I have ssh on this box and can verify that other than XOrg going into a restart loop and burning a few CPU cycles (until I run sudo /etc/init.d/gdm stop) everything else is unaffected.   If anyone has a patch to try, I have a head on this box but mostly treat it as headless, so I'm in a good position to try out patches.

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Xorg crash
https://bugs.launchpad.net/bugs/566324
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