this fix seams to solve  problems: 
https://bugs.freedesktop.org/show_bug.cgi?id=47535#c10
(I have Intel Core i5-2400 CPU (Sandy Bridge) processor with GPU and no other 
graphic card)

Anyway  I reinstall the 12.04 from scratch and after I applied all available  
updates (still on kernel 3.2.0.24) I put the line
sudo intel_reg_write 0x2120 '0x1206800'
in /etc/rc.local.
After that (for 3 or 4 days now) I don't have any freeze, and even Google Earth 
work OK.

PS

I don't know if this is important but in Compiz (CCSM) under OpenGL I
unchecked "Sync To VBlank" also.

** Bug watch added: freedesktop.org Bugzilla #47535
   https://bugs.freedesktop.org/show_bug.cgi?id=47535

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https://bugs.launchpad.net/bugs/993187

Title:
  ubuntu 12.04 completely freezes frequently

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