When I step away from my Linux computer for a while, the system locks and I have to enter my password to unlock it.

How can I change the time before the system locks?

I've hunted through all the GUI menus and haven't found anything. There are some settings in /etc/login.defs but they all seem to apply to logging on to the system and not to timing out after the initial login.

I'm running Linux Mint 10. I'm also testing some other distros (Debian, OpenSuse, Fedora, PCLinuxOS, and Arch), so I'm looking for both distro-specific and general solutions.

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I'm pretty sure this is a GNOME thing, because it doesn't happen on the Kubuntu system I'm currently using. – user55325 Apr 7 '11 at 5:06
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On Ubuntu 10 running Gnome:

System -> Preferences -> Screensaver. There's a checkbox to lock after the screensaver activates, and there's checkbox and a slider to activate the screensaver after a certain amount of time.

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And I just found that on Linux Mint, it's under Preferences -> Screensaver. There's a slider to adjust how long before the screensaver is active, and a tick box for 'Lock screen when screensaver is active'. – James Magruder Apr 8 '11 at 2:26
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For Fedora 14, it is in the screensaver settings under something like "require password to return from screensaver." I don't remember the exact phrasing as I am not booted in fedora at the moment.

EDIT: I am running GNOME with Fedora 14.

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