Comment 6 for bug 581496

This bug appears to involve a freeze of Xorg, probably due to a GPU
lockup in the kernel drm code, in a version of Ubuntu before
natty (or we couldn't determine the version from the report).

The X team has been investigating GPU lockups in Intel's video driver
during the natty development cycle. Many of these issues are now either
resolved or at least well understood. There are also better tools for
capturing and diagnosing these problems, but these tools are either
unavailable or incomplete in older versions of ubuntu, so debugging this
issue on pre-natty versions is unlikely to be productive. We're closing
out the bug report for this reason.

However, you may not yet be ready to upgrade to natty. It turned out
that a large number of these freezes were solved by updates to the
kernel. Thus, updating your kernel may be a workaround for you.
Updated kernel packages are available a variety of places, such as:

  http://kernel.ubuntu.com/~kernel-ppa/mainline/

If you find a newer kernel fixes it, and think the fix should be
backported to earlier Ubuntu versions, please file a request against the
linux kernel in Ubuntu, indicating the broken and the fixed kernel
versions.

If it does not fix it, and you do not wish to upgrade to natty, please
follow up through technical support channels (e.g. http://askubuntu.com
is a good place for free support for older Ubuntu versions).

On the other hand, if you find after upgrading to natty and updating to
latest that you still experience GPU lockups, please reproduce the
problem, ssh into the frozen machine, and collect the file
/sys/kernel/debug/dri/0/i915_error_state and the output of 'dmesg >
dmesg.txt', and attach both to a new bug report.