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You can install xautolock which runs an arbitrary command as a screen locker. For instance, mine looks like this: tvservice -o DISPLAY=:0 xev -geometry 1900x1200 | stdbuf -o0 grep Motion >&- tvservice -e "CEA 4" The first line shuts down HDMI signal, making the TV go to sleep. The second line starts the "X event" tool in a window which is bigger ...

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