[Hardy] SRU request for LP#257293

[Stefan Bader]

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https://bugs.launchpad.net/ubuntu/hardy/+source/linux/+bug/257293

Note: The fix to this went into v2.6.27-rc1 upstream, so Intrepid should get it
automatically.

SRU Justification:

Impact: The GART code is missing suspend resume support which means, certain
setup steps will not be performed after resume which can cause memory
corruption in the worst case.

Fix: The fix is done in two steps (following upstream): first this add suspend
and resume callbacks and then it adds the necessary code to set up the
registers after a suspend.

Testcase: See bug report.
- --

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