How to hide desktop or to show black screen so I can display images and videos by fbi and omxplayer without seeing desktop when next image is loaded?
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You can try to switch off the backlight if available for your display. On the command line you can do it with:
rpi ~$ sudo /bin/sh -c 'echo "0" > /sys/class/backlight/soc\:backlight/brightness'
and on again:
rpi ~$ sudo /bin/sh -c 'echo "1" > /sys/class/backlight/soc\:backlight/brightness'
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