I have found a suitable work-around for this bug.
After changing PowerMizer mode from "Adaptive" to "Performance" the screen 
corruption stopped to happen. I have tested it for three hours. Taking in 
consideration that the failure happened before with frequency about 7 minutes, 
I suggest that the erroneous behavior is somehow connected to frequency 
altering.
There is a related thread @ ubuntuforums: 
http://ubuntuforums.org/showthread.php?p=9066892#post9066892

-- 
Screen garbage, mostly affecting fonts, appears after some minutes of desktop 
usage.
https://bugs.launchpad.net/bugs/532111
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which is subscribed to nvidia-graphics-drivers in ubuntu.

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