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I have installed Ubuntu 12.04 on my lenovo G580 laptop. When I close the laptop (goes into hyvernation mode) and open it, sometimes my screen freezes (I can still see my mouse moving, but that is all). I suspect something went wrong about x, or unity or something, but that's my best clue.

I can still access other tty, so I would like to know how to diagnose this situation using tty.

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