I was just hit by this one as well. 
For me, this was triggered by watching the Dr. WHO preview on this page, and 
clicking the fullscreen option.
http://weblog.fok.nl/viewSingleItem/35203/Doctor-Who%3A-een-voorproefje.htm

The screen froze, but the system kept operating as usual. I used
ctrl+alt+f1 to open a terminal to investigate the problem and trigger a
reboot. I was also able to switch back and forth to the (still frozen) x
session.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/743408

Title:
  [sandybridge-gt1] GPU lockup (IPEHR: 0x02000004)

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