Did you do an upgrade or a clean install? The issue has been there since 11.04 and I think its fixed now(at least for me), so a clean install may get it working properly...
Help! When I suspend Ubuntu 12.04 I can't wake it up again. I will just see a black screen with a small white line at the bottom (graphics bug). #ubuntu1204 Any got a clue how to solve this? I'm using a T500 Thinkpad.
Maybe this bug affects you: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/966744
no my mouse and keyboard do not respond and it happens ALL the time. I just got one more clue: When I press CTRL+ALT+F1 and then CTRL+ALT+F7 the same thing happens. It seems as if unity is somehow not able to restart itself?
There are many other things to try in this thread, despite it being for earlier versions of Ubuntu/kernels, it might be a regression:
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