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/757399
Title:
[gm45] GPU lockup (IPEHR: 0x01820000)
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