Comment 6 for bug 224037

I've had the same issue on a similar spec system using Gutsy with 2.6.22-14. I installed the Hardy kernel 2.6.24-16 from backports (sam,e thread as linked above) and it has now fixed this issue - had to do some other tweaks to get hibernate working (to do with 7900GS, setting no POST on resume in /etc/default/acpi-support, and enabling NvAGP in xorg.conf), but it is now hibernating OK.

System spec in case it helps someone:

Intel Core 2 Duo E8200
Gigabyte GA-P35-DS3R motherboard
NVidia 7900GS