Hello,
The bug is still there after upgrading the BIOS.
I should add that I only have the problem with Firefox and Thunderbird, but not 
the KDE apps.
I suspect the problem is related to GTK: some programs like grsync and gimp 
seem OK, but I've seen they don't display much text like firefox or thunderbird 
do. I've seen the bug in some text fields displayed by Handbrake

Matthieu
P:S: output of the dmidecode commands:
A16
12/06/2013


** Changed in: xorg (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1354841

Title:
  Screen corruption (characters are drawn as black squares)

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