I just re-installed Fedora 40 KDE on the minibook x 2023. Because Kubuntu 24.04 screen updates are slow.
Some typos corrected from my previous post.
Terminals and splash are in landscape by setting the kernel parameters:
sudo grubby --update-kernel=ALL --args=“fbcon=rotate:1”
sudo grubby --update-kernel=ALL —args=“video=DSI-1:panel_orientation=right_side_up”
Desktop is in landscape by Settings, System Settings, Display & Monitor, Orientation
Desktop is scaled to 150% by Settings, System Settings, Display & Monitor,Scale
In the logon settings you set to follow plasma settings to get the logon screen in landscape.
No autorotation out of the box.
Cheers, Jaap