Just carried out latest large unstable update, running KDE on an RPI-5.
The login screen does not now give the option to use wayland or X11, only wayland.
This is a problem for me. I use two screens, and using wayland the cursor randomly gets stuck when jumping from one screen to the other. In this situation the keyboard also does not respond and so I have no option other than doing a manual hardware reboot.
Any suggestion on how to get the X11 option back?
That is correct - at least for x86-64 branch - where you need to explicitly sync kwin-x11-session to get that option.
I would think this could be the same for ARM based systems.
Until this latest update, the login screen provided the option of wayland or x11.
Can you give detailed commands for how to get it back?
https://archlinux.org/news/plasma-640-will-need-manual-intervention-if-you-are-on-x11/
If you are scratching your head on how to do so
run
sudo pacman -Syu plasma-x11-session
then
systemctl soft-reboot
That fixed it. 
Thank you.
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