Public bug reported:

Binary package hint: policykit-1-gnome

the "found proprietary driver" icon showed up in the bar, i pressed and found 
that there is a tested ATI driver, i was happy and surely installed it to see 
the new visual effects of unity. After the restart, everything seems great 
until i enter my login pass and see my desktop background, suddenly black 
screen comes and my mouse seems to reveal it square by square by moving around 
, also newly opened windows are balcked once i click inside them and are not 
viewable till i drage the window by the bar just to attempt to see where to 
click.
my GPU mode: AMD mobility 5470 on Dell N5010

** Affects: policykit-1-gnome (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd ati driver proprietary screen

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https://bugs.launchpad.net/bugs/748753

Title:
  when installing ATI proprietary driver, desktop became unusable

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