Ack, post this on mythtv wiki (was down when I tried)
26 Mar 2012===Fedora 16: Turn off “screen blanking”===
Upstream Gnome has decided to not use a screensaver anymore, and just uses a technique to blank the screen, and turn off your monitor. This may not be desirable with your MythTV front-end in order to disable it, you may need to disable DPMS (Energy Star) at start-up and
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Create a startup script in: ** /etc/X11/xinit/xinitrc.d/xset-dpms.sh ** containing: #!/bin/bash xset -dpms
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Make it executable: chmod a+x /etc/X11/xinit/xinitrc.d/xset-dpms.sh
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Install dconf-editor: yum install dconf-editor
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From a terminal in Gnome run dconf-editor ** From the dconf-editor GUI look in: org->gnome->desktop->screensaver. ** Set the “idle-activation-enabled” boolean to false (unchecked).
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Grin with a disabled screen-saver / screen-blanking system.
(Credit to [http://forums.fedoraforum.org/showpost.php?p=1547438&postcount=16 rabrant on fedoraforum.org])