screensaver doesn't kick in or display doesn't suspend/sleep

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http://forums.fedoraforum.org – Hi all, Anyone noticing intermittent problems with the screensaver not kicking in or the display not sleeping? This is in gnome under F11. I have the Power Management Preferences set to put the display to sleep after 30 minutes of inactivity and gnome screensaver is configured for 5 minutes idle time. On a regular basis, I'll leave my computer come back and a) the screensaver hasn't kicked in or b) the screensaver kicked in, but the power management features didn't kick in to put the display to sleep. It seems to be an intermittent problem and usually it goes away after I restart X, but then at some point it comes back. In the past, I've gotten in the habit of being logged in for weeks/months at a time but I find that I can't go more than a few hours without logging out and back in or else the screen won't go to sleep. Any ideas? (HowTos)