You may have noticed the blanking of screen after an idle timeout. This may be annoying while you are watching a movie. So If you want to disable the X screen blanking that comes up unexpectedly while you’re watching a movie in MPlayer or …,
Type this at terminal

setterm -powersave off -blank 0

To make the change permanent, add the following to your ~/.xinitrc file:

$ vi .
add this line
setterm -blank 0 -powersave off -powerdown 0 xset s off


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