I was having this problem in Debian 64-bit due to my motherboard's support of 
usb 3.0 (module xhci). Suspend works when I remove the XHCI module (rmmod 
xhci). Hibernate I think also works ( I am having some issues but it's due to 
my swap setup I believe). I read somewhere to make the fix permanent, add the 
following to /etc/pm/config.d/00sleep_module (create the file if it doesn't 
exist):
SUSPEND_MODULES="xhci"

Works for me!

I think this bug is a duplicate or is related to #522998:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/522998

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USB device 8087:0020 prevents suspend / hibernate
https://bugs.launchpad.net/bugs/522263
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