On my IBM ThinkPad X31, I can only do one successful APM resume.  After 
the resume, there's a stream of messages on the console:

uhci_hcd 0000:00:1d.0: host controller process error, something bad happened!
uhci_hcd 0000:00:1d.0: host system error, PCI problems?
uhci_hcd 0000:00:1d.0: host controller process error, something bad happened!
uhci_hcd 0000:00:1d.0: host system error, PCI problems?
uhci_hcd 0000:00:1d.0: host controller process error, something bad happened!
uhci_hcd 0000:00:1d.0: host system error, PCI problems?
uhci_hcd 0000:00:1d.0: host controller process error, something bad happened!
uhci_hcd 0000:00:1d.0: host system error, PCI problems?
uhci_hcd 0000:00:1d.0: host controller process error, something bad happened!
uhci_hcd 0000:00:1d.0: host system error, PCI problems?
uhci_hcd 0000:00:1d.0: host controller process error, something bad happened!
uhci_hcd 0000:00:1d.0: host system error, PCI problems?


The second resume, the machine panics.  I haven't managed to get the 
panic message yet.

This happens with both -rc3 and -rc4.

If I unload the USB modules before the suspend,  then I can 
suspend/resume as many times as I like.  Curiously, if I reload the 
modules, I can continue suspending/resuming without obvious problems, 
though it does print "Trying to free free IRQ11" each time it resumes, 
and a new "uhci_hcd" appears associated with a number of interrupts.

    J