You could probably use the script in the last post if your using gnome. Then just change the command to something like "gnome-session-save --logout" and set your screensaver to the time you want.

http://www.linuxquestions.org/questions/fedora-35/start-and-stop-script-with-screensaver-728498/

I haven't tried it though.

--- On Sun, 6/5/11, betty <nicepenguin@webcanine.com> wrote:

> From: betty <nicepenguin@webcanine.com>
> Subject: log out
> To: plug-discuss@lists.plug.phoenix.az.us
> Date: Sunday, June 5, 2011, 3:11 PM
> thanks for the responses;
> i guess screen lock would work.
> but what i am looking for is for a situation like this;
> i'm working at my computer, i get up to do something else
> and may or may not be back to the computer for 10 minutes or
> more.
> i don't want to have to  go to something like screen
> lock or log out, i want the computer to automatically log me
> off if it is left unattended for more than 10 minutes.
> in the interim until someone comes up with something, if
> there is something, i guess i'll use screen lock.
> 
> -- betty i.
> www.webcanine.com
> information for people
> who care for dogs.
> 
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