I'm experiencing the same issue on Ubuntu 12.04 LTS, running Unity 3D and the 
onboard Ivy Bridge GPU (Intel HD 4000).
Symptoms: Desktop freezes, no response from mouse or keyboard, can't change 
TTY, Magic SysRq not working. Complete freeze.

Affected system:
Intel Core i7 3770K 3.5 GHz
Asus P8Z77-V Deluxe

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https://bugs.launchpad.net/bugs/993187

Title:
  ubuntu 12.04 64bit completely freezes frequently

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