New answers tagged display
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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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