I am running Ubuntu 11.04 x64 Natty Narwhal. When my mouse is not moved for 5 minutes the screen fades out and I need to enter my password in order to log back in. I have tried to increase the timer because 5 minutes is very short when watching movies. It seems like it should be in the screensaver window where I have Regard computer idle after set to 1 hour, activate screensaver on idle checked, and lock screen when screensaver is active unckecked. I also went to the power management window, and I have put computer to sleep when inactive for never, spin down hard disks when possible unchecked, and put display to sleep when inactive for never.
With these settings, it seems like the computer should go to screen saver after an hour and not require a password to log back in. Instead I get no screensaver, and I am locked out after 5 minutes.
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