I’m using EndeavourOS with KDE.
The display is correctly oriented when logged in but it doesn’t rotate correctly when I’m logged out.
EDIT: corrected the post. This happens when logged out, locking the screen has it displayed correctly.
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Put one hand on the top and one on bottom and rotate the screen by 90° or π/2 radians
If you have to read PDFs regularly having a vertical monitor is a lifesaver.