It seems I can now successfully suspend, at least 5 times so far and
resume properly, using the following parameters:

Kernel from mainline - 2.6.32-rc7, using parameter "modeset=0"

and

The ATI driver only from the following PPA
https://launchpad.net/~xorg-edgers/+...e/drivers-only

While this has worked for my HP DV8040, with ATI 200m Video card RS480
5955, I do not know if this works for you.

-- 
screen backlight off after resume-from-suspend when using ATI KMS
https://bugs.launchpad.net/bugs/434956
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