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I can switch to another Terminal via CTRL+ALT+F2, but the screen remains black and won't wake up. Sometimes, it wakes up after several retries.

Any ideas to resolve it?

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how many graphic cards does your laptop have? – Sergey Sep 2 '11 at 11:18
Does pkill screensaver stop it immediately? Does pgrep screensaver actually output anything? – rozcietrzewiacz Sep 2 '11 at 11:19

Sounds like your system is going to sleep and not recovering cleanly.

Check your power-saving settings. It may be 'hard' sleeping after a few hours of no activity. You can probably set it to not do that.

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