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It seems like when I have certain web pages focused, my screensaver will kick in, but the screen won't turn itself off. Does anyone have any ideas why this might be? Is there a way to disable whatever is keeping DPMS from kicking in?

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The whatever is probably a movie playing plugin. As far as I know, it's a global X server setting that any client can change (xset dpms …) on the command line. – Gilles Sep 4 '10 at 18:22
@Gilles maybe... though I usually leave my browser on Google Reader. – xenoterracide♦ Sep 4 '10 at 19:21
I know mplayer will do that, and it seems to be permanent; once I've played a video in mplayer my DPMS is disabled until I reenable it or restart. Gilles is probably right, but you'd have to experiment – Michael Mrozek♦ Sep 4 '10 at 20:26
@Michael For me mplayer only keeps the screen disabled while playing... my screen will still shut off if it's not playing... well when I'm not using it I always leave smplayer minimized to systray – xenoterracide♦ Sep 4 '10 at 20:31
@xeno Interesting; must just be something I messed up with my configuration – Michael Mrozek♦ Sep 4 '10 at 20:52
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2 Answers

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Do you have SELinux enabled? My machine uses the ATI binary blob and it always gets denied to so the monitor is simply black.

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My idea: your flash player locks this feature.... check if it's only happening with flashed webpage.

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