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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If you're using Wayland, you can go to Settings -> Colors & Themes -> Login Screen (SDDM) and click "Apply Plasma Settings..."
If you're using X11, it looks like you'll have to resort to hacky scripts, unfortunately.
Source: https://discuss.kde.org/t/how-to-change-monitor-layout-and-orientation-in-sddm/3377
I’m using Wayland, where do I find this settings gui?
This is the system settings application for the KDE desktop environment.
Ah, so being on Hyprland means I can’t really gain access to this, right?
Correct. Unfortunately, it's something that each desktop environment or window manager has to implement themselves. But all the button is doing is moving some config files around, so you can probably do some digging to figure out what it's copying to where.
Yeah, I’ve largely figured out how to change all these settings from configs for myself, just always on the lookout for a nice gui. I’m slowly working to make a Linux experience I can install for my relatives that makes the transition from crapware Windows relatively painless.
XDG_SESSION_THEME=KDE got my hyprland config to work on everything except the cursor (other than in Firefox/steam for some reason). Took me way too long to find the old reddit post that had this tip, so I hope it helps!