Note for future me. Switching to CachyOS, but I want to run Plasma under X11. I tried Wayland — did not like it: laggy and font rendering looks weird. Spent from 4PM until 3AM figuring out why X11 does not work. So this is the note. I think the main culprit is plasmalogin — I switched to SDDM and things are working. What I tried: disable rootless X, auto-run xrandr --auto from different types of scripts, copy/paste x.conf from Pop!_OS setup, set somewhere plasmax11, try to run plasmalogin in X11.