ok one more comment.

Those who know how to add kernel parameters via the grub boot menu, and
have a Sandybridge(!) platform please try adding
'i915.i915_enable_fbc=0' to the parameters to see if it helps with the
hangs. This disables framebuffer compression, which got disabled for
sandybridge in kernel 3.3. It's also queued in the 3.2 stable queue, and
the commit is a oneliner which might make it in the next upload to
precise-updates..

Andrzej: no, you have nvidia hardware. Please file a new bug with
'ubuntu-bug xorg'.

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

Title:
  ubuntu 12.04 completely freezes frequently.

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