I have had a similar problem and determined the problem due to the USB driver. 
Please see 
Bug #128322.

try as root:
rmmod ohci_hcd 

to see if the machine then enters suspend.

It may not recover from suspend if using the nv video driver from
another bug I'm just about to file.

-- 
suspend to ram 2.6.22-8
https://bugs.launchpad.net/bugs/126214
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