I have the same problem. I really can't use my computer for more than 5 minutes!
As CPU hangs, the screen freezes and becomes full of noise, garbage, etc.
Only the mouse works!


$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL Integrated 
Graphics Controller (rev 0e)


** Attachment added: "Xorg log, as you can see "intel_uxa_prepare_access: bo 
map failed: Input/output error" line repeats several times"
   
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/769977/+attachment/2102402/+files/Xorg.0.log.old

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https://bugs.launchpad.net/bugs/769977

Title:
  Sudden video crash on intel chipset

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