In Wayland, KDE Plasma supports automatic screen rotation (in tablets and convertible laptops) after installing iio-sensors-proxy and enabling tablet mode.
However, automatic screen rotation does not work in X11.
How to enable automatic screen rotation in X11?
The Screen Rotator app can enable automatic screen rotation.
Install iio-sensors-proxy if you already have not.
Then, install the app with yay -S screenrotator-git
Finally, add Screen Rotator to startup programs, and reboot.
Wow! You solved the problem in 3 minutes!
Congrats!
I wrote the previous post to share my solution 
Ah, I see!
In that case, if this was a sort of How-To tutorial, the “convention” of the forum is to add [How-To] to the title of the topic.
No need to create two posts and mark one as solution.
Example:
Yes, it was meant to be a how to tutorial. Thank you for informing me about the convention, I will follow your suggestion in the future.
Now that I have already created two posts, should I remove the latter and edit the first post into a [How To], or should I leave this as it is?
Up to you, do as you wish!
I am glad you found the solution to the issue and appreciate that you wanted to share it with the community! My congrats still stand!
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