Please try a 3.4 mainline kernel from here:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-precise/
if it fixes the bug, then this is a dupe of bug 966631
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/906269
Title:
[sandybridge-m-gt2+] GPU lockup render.IPEHR: 0x7a000002
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