I can now reproduce this consistenly I think:
Install Ubuntu Precise
Add xorg-edgers ppa
Create a 2:nd user
Log in as user 1
Switch to user 2
Switch to user 1

Then when you have unlocked user 1's screen with your password and it
redraws the desktop I get a GPU reset loop.

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https://bugs.launchpad.net/bugs/936159

Title:
  Xorg freeze, radeon gpu lockup with softreset

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