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The correct way to start a GUI app is with autostart. There are many examples on this site.


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The solution of dhruvvyas90 works: xset s reset && xset dpms force on but this shorter version also seems to work fine: xset dpms force on


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Rotating the screen for the Raspberry Pi 4 Due to the new video driver used for by  the Raspberry Pi 4, you are unable to rotate the screen using the old /boot/config.txt method. If you want to rotate the screen on a Pi 4, we recommend that you use the Screen Configuration tool as it is much simpler to use. Instead you will need to make use of the xrandr ...


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