This happens to me too. I have a laptop with a PCI-Express video card.
So I added the following two lines to /etc/modprobe.d/blacklist

blacklist intel_agp
blacklist agpgart

Also, in the device section of my xorg.conf, I added:

Option "NvAGP" "0"

Do this and try hibernating now. If it doesn't work, here is the weird
part: keep the settings above and run glxgears on a xterm for about 15
seconds, before trying to hibernate. I guess this may initialize some
junk in the nvidia module. After doing this, my system powers off after
I click on hibernate. Sometimes it reboots instead of powering off. I'm
going to try uswsusp now and see if there is any difference.

This thing with glxgears affecting hibernate makes me wonder if those
people reporting working hibernate are also beryl/compiz users. Hum...

-- 
Hibernate will not poweroff laptop at very "last" step
https://bugs.launchpad.net/bugs/73805
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