please have a try with latest AMD/ATi drivers ver. 8.42. with those shipped 
with Ubuntu Gutsy 7.10 I experienced this problem too, but now after upgrading 
I can again suspend and hibernate without any issue.
http://www2.ati.com/drivers/linux/ati-driver-installer-8.42.3-x86.x86_64.run

please remember to run aticonfig --initial after installing and also
that after each further kernel update you will need to re install them
as far as the package will not be provided directly from ubuntu
repositories.

** Changed in: acpi (Ubuntu)
       Status: New => Fix Released

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fglrx prevents hibernate / suspend
https://bugs.launchpad.net/bugs/128617
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