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[Steve Roberts <434956@xxxxxxxxxxxxxxxxxx>]

Not sure if mine is exactly the same issue:

Maverick 64 bit, ATI graphics card

Suspend and hibernate worked on 10.04. Following upgrade (clean install)
failed to resume from suspend and hibernate. pm-log indicated success,
computer powers up, but display is blank.

Could successfully suspend/hibernate and resume from recovery console
using pm-suspend/hibernate.

Adding radeon.modeset=0 meant that suspend and resume now work.... But
this messed up my dual monitor configuration and had to create xorg.conf
file.

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https://bugs.launchpad.net/bugs/434956

Title:
  screen backlight off after resume-from-suspend when using ATI KMS