Might be a dupe of bug 737110. Can you see if adding this to your
xorg.conf helps?

  Option "DebugFlushCaches" "True"

or

  Option "DebugFlushBatches" "True"

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/752249

Title:
  [q45] GPU lockup (0x01820000)

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