I have tested the mainline kernel:

$ uname -a
Linux fry 3.4.0-030400rc2-generic #201204072235 SMP Sun Apr 8 02:36:11 UTC 2012 
x86_64 x86_64 x86_64 GNU/Linux

The bug is still there as you can see in the attached screenshot

** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream

** Attachment added: "Screenshot of Ubuntu Software Center"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/979712/+attachment/3054699/+files/Captura%20de%20pantalla%20de%202012-04-12%2020%3A25%3A30.png

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https://bugs.launchpad.net/bugs/979712

Title:
  AMD/ATI graphic cards sometimes produces weird black squares in screen

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