I'm having a similar bug with the radeon driver.  Randomly (though often
when watching youtube) the screen would just stop updating.  I could
move the mouse cursor around and I think it was accepting keyboard input
but nothing on the screen updated.  I could ctrl-alt-f1 over and kill
the x session and everything would be fine for awhile again.

However, for me it just started happening which led me to test if it was
related to recent kernel upgrades.  I rebooted with 3.2.0-23 and now I
don't seem to have this bug!  I did not test 3.2.0-24, but I definitely
see the bug with 3.2.0-25.

linux-image-generic-pae:
  Installed: 3.2.0.25.27
  Candidate: 3.2.0.25.27
  Version table:
 *** 3.2.0.25.27 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-proposed/main i386 
Packages
        100 /var/lib/dpkg/status
     3.2.0.24.26 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main i386 
Packages
        500 http://security.ubuntu.com/ubuntu/ precise-security/main i386 
Packages
     3.2.0.23.25 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main i386 Packages

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https://bugs.launchpad.net/bugs/994203

Title:
  Xorg freeze with Nouveau  drivers

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