Corrections to my previous post: installing 12.04.3 I got kernel 3.8, not 3.2, 
so I saw glitches in 12.04.3 with 3.8.
Now I installed a 12.04.0 then after a dist-upgrade I got kernel 3.2-58. I 
installed also images for 3.5.0-45, 3.8.0-35 and 3.11.0-15.
Using each of these kernels I can't see glitches in dash but I experience 
instabilities in xorg when using glmark2 or sometimes even using glxgears 
-fullscreen.
I checked the video card for defects using winxp + nvidia drivers + furmark and 
seems all ok.
I'll try to ask to freedesktop team, is this a problem in the 2D driver or in 
the 3D/OpenGL driver Mesa?
Thanks for your help.

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https://bugs.launchpad.net/bugs/1266807

Title:
  [NV44] Glitches in dash with GeForce 6200 SE TurboCache

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