interesting sentence on intels graphics website:

http://intellinuxgraphics.org/2012.02.html

Additionally, the following stability patches are currently available in
the drm-intel-fixes branch and should be available on the stable 3.2.x
kernel after this release:

Stability fixes for hard hangs on Ivy Bridge platform: those patches fix
occasional hard-hangs on Ivy Bridge platforms when running GL workloads:
patch 1, patch 2, patch 3, patch 4.

perhaps ubuntu is missing these fixes...

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

Title:
  ubuntu 12.04 64bit completely freezes frequently

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