Happened to me after return from suspend.
Resulted black screen for both VT and Graphical modes until reboot.

Oneiric:
xserver-xorg-video-intel=2:2.15.901-1ubuntu2
linux-image-3.0.0-12-generic-pae 3.0.0-12.20

Attached kern.log nothing unusual in Xorg.x.log


** Attachment added: "kern.log"
   
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/881867/+attachment/2578540/+files/kern.log

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You received this bug notification because you are a member of Ubuntu-X,
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https://bugs.launchpad.net/bugs/881867

Title:
  [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU
  hung

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