Oops! I messed up the graphics drivers

[diodelass]

Okay! I hung out on IRC for a minute and got the solution.
The problem is apparently that the three driver packages I installed do, to some degree, overlap, and by installing them willy-nilly. I mucked it up. I fixed it by force-reinstalling the original driver package and all its dependencies, like this:

Code:

sudo apt-cache depends libmali-rk-midgard-t86x-r14p0 | grep Depends: | cut -d: -f2 | xargs sudo apt install --reinstall -y
sudo apt install --reinstall libmali-rk-midgard-r14p0

and now KDE and sddm both work again.

Perhaps with this new knowledge I will make another attempt to get KDE working in Wayland...