Hi,
I updated the bios. 
The problem still remains, but the occurence time has reduced.

Now I have the problem only once a day.

If can be usefull, please consider that the problem does not appear
inside external applications windows. For example, VirtualBox sessions
are not affected by the issue.

Here is the output of the command " sudo dmidecode -s bios-version &&
sudo dmidecode -s bios-release-date"


V1.07
08/10/2012


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

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https://bugs.launchpad.net/bugs/1458663

Title:
  Characters disappear and graphic major problems

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