if I execute "sync" before pressing the suspend button it helps for me.
(don't know why)
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suspend/resume failure during second suspend [non-free: nvidia]
https://bugs.launchpad.net/bugs/350477
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Public bug reported:
Suspend/resume fails sometimes with black screen, not always
ProblemType: KernelOops
Annotation: This occured during a previous suspend and prevented it from
resuming properly.
Architecture: amd64
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/share/apport/apportcheckresume
** Attachment added: "logs.tgz"
http://launchpadlibrarian.net/26623363/logs.tgz
** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/26623364/BootDmesg.txt
** Attachment added: "CurrentDmesg.txt"
http://launchpadlibrarian.net/26623366/CurrentDmesg.txt
** Attachment added:
