It's a consequence of a hardware issue that prevents the GPU from
working correctly under VT'd. I would strongly advise not to use the
Ironlake GPU under these circumstances. Or try SNA in raring.

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/914216

Title:
  [arrandale] xorg very laggy when Intel vt-d is enabled

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