Public bug reported:

My hardware is an Intel HD 3000/i7 GPU.

To reproduce this bug :
- you have to install the xorg edgers packages (mesa)
- you have to run Unity 7 series, either from staging PPA or Raring
- try repositioning an icon in Unity launcher by draging and dropping

Expected result :
- icon repositioning

Actual result :
- GPU lockup, screen corruption, display flickering
- killing Unity process doesn't work (corruption is persisting), you have to 
restart X.

** Affects: mesa (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1134557

Title:
  [xorg-edgers][Unity 7 series]GPU lockup/Screen corruption on drag and
  drop in launcher

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