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
*** This bug is a duplicate of bug 739801 ***
https://bugs.launchpad.net/bugs/739801
Thank you for taking the time to report this crash and helping to make
Ubuntu better. This particular crash has already been reported and is a
duplicate of bug #739801, so is being marked as such. Please
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https://bugs.launchpad.net/bugs/743408
Title:
[sandybridge-gt1] GPU lockup (IPEHR: 0x0204)
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