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I lock my computer. Accidentally the mouse moved. Then the lock menu was shown by the computer. Can I lock it without input the password and lock again?

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What do you mean "can you lock it without password"? If you had locked your desktop, and your mouse moved afterwards, then it is still locked. There's no need for you to lock it again. – Peachy Oct 28 '12 at 6:47
@msPeachy I mean can i lock the screen without: unlock the screen then lock it again. – lambda23 Oct 28 '12 at 7:08
up vote 2 down vote accepted

Can we assume you are using 12.04 or 12.10...

Just press Esc to remove 'Unlock' dialog.

Yes, there is a shortcut to lock screen (if unlocked). Just press Ctrl+Alt+L, to immediately lock the screen.

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@Eliah I should remember to use kbd-meta when adding comment. – david6 Oct 29 '12 at 8:00

A shortcut to turn the screen off again does not exist. You should wait for a few minutes or you unlock and lock again.

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