I have the same problem with an Asus A6Jc laptop, with a nvidia
GeforceGo 7300. The screen goes black, there is some disk activities,
and then nothing, it stays on, and I have to turn it off, and back on
with a new session (the memory was not written to the disk). The problem
disappeared when I deactivated the nvidia proprietary driver in the
restricted manager, so I think the problem is between the nvidia driver
and the ACPI kernel functionalities.

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unable to hibernate using nvidia restricted drivers
https://bugs.launchpad.net/bugs/181693
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