Systems to manage power consumption, such as system suspension and hibernation, CPU speed adjustment, disk spindown, battery usage monitoring, …

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Xscreensaver causing my monitors to turn off and on repeatedly when its power management features are active; how to fix?

Something weird is up with my Xscreensaver 5.15 configuration on Debian Wheezy. I have two Dell U2412M monitors hooked up to a single graphics card (one over native DVI and one over HDMI output to DVI ...