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
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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[regression] i810 to intel driver change: hard freeze when resuming from
monitor poweroff
https://bugs.launchpad.net/bugs/239963
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