Maybe your problem is similar to Bug #138256. The fix for this issue
might be to force enabling Pipe A.
Add the line >>Option "ForceEnablePipeA" "true"<< to your xorg.conf
under the device section.
Section "Device"
...
Option "ForceEnablePipeA" "true"
EndSection
--
xorg crashes on resume from disk - Error in I830WaitLpRing(), timeout for 2
seconds
https://bugs.launchpad.net/bugs/237378
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