I don't have much experience in that area so I can't be sure, but I
think it would need to be backported.  It will probably show up in the
xorg-edgers PPA soon.  See https://launchpad.net/~xorg-
edgers/+archive/ppa?field.series_filter=precise for detail on how to
install and uninstall.  Note in particular the warning to install the
whole PPA and not just individual packages from it.  The other option is
to compile it from source on your machine - see
https://help.ubuntu.com/community/CompilingSoftware

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https://bugs.launchpad.net/bugs/541492

Title:
  MASTER: [i845] GPU lockup

Status in X.org xf86-video-intel:
  Fix Released
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Triaged
Status in “xserver-xorg-video-intel” source package in Lucid:
  Triaged
Status in Baltix GNU/Linux:
  New

Bug description:
  Binary package hint: xserver-xorg-video-intel

  This is a MASTER bug report, i.e. not a real bug report, but a tool to
  help manage other bug reports.

  Most bug reports on i845 are probably due to the CPU/GPU incoherency
  problem that is now consolidated upstream at
  http://bugs.freedesktop.org/show_bug.cgi?id=26345 . For now, we mark
  all automatically reported GPU lockups as duplicates of this unless
  there is a reason not to.

  
  To use the available fix, run the following commands:

  apt-add-repository ppa:glasen/855gm-fix
  apt-add-repository ppa:brian-rogers/graphics-fixes
  apt-add-repository ppa:glasen/intel-driver
  aptitude update
  aptitude install linux 855gm-fix-dkms
  aptitude dist-upgrade

  
  There is a similar master bug report for i855 at bug 541511.

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