The manual says that xscreensaver will stop running graphics demos when my monitor goes into power-saving mode, but it doesn . Why?
The only way that xscreensaver can tell that the monitor is in power-saving mode is by asking the X server. There is a server extension specifically for asking these sorts of questions, called “XDPMS”, and xscreensaver uses that. So it may be that your X server doesn’t support the XDPMS extension (you can tell by running “xdpyinfo”). Or, it may be that the extension is supported, but the X server doesn’t actually know how to talk to your hardware to ask it whether it is powered on or off. The latter is especially likely on laptops: many laptops have monitor power-saving behavior built in at a very low level that is invisible to Unix and X. On such systems, you can typically only adjust the power-saving delays by changing settings in the BIOS in some hardware-specific way. If the Power Management settings in the Preferences panel are grayed out, then that means that either: xscreensaver was compiled without DPMS support; or xscreensaver believes that your system does not support power m
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