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[Babaei <781402@xxxxxxxxxxxxxxxxxx>]

This issue didn't initially affect me, but starting maybe a week ago
(perhaps related to a compiz/Xorg update?), my machine started to
occasionally refuse to return from the sleeping screen (launched from
the screen saver, after letting the machine set for a while, or letting
the machine sit overnight). The screen remains unpowered and all key
combinations (eg alt-ctrl-F1) are ignored. If I have music streaming (eg
VLC), the audio continues and the network light shows traffic.

The last time it happened, I was able to SSH into the machine. top
reported that Xorg was pegged at 100%. I kill -9'ed Xorg and the screen
came back alive (with the login prompt, of course). I didn't see
anything particularly telling in the Xorg logs (or system logs).

I'm running Ubuntu 11.04 64-bit with Unity on a Dell Vostro 1400 laptop
(with the discrete Nvidia GeForce 8400M GS running the proprietary
current version 270 Nvidia driver). I am going to try solution #12 to
see if it helps.

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https://bugs.launchpad.net/bugs/781402

Title:
  Ubuntu 11.04 / Unity freezing when screen is 'woken up'

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