OctoBTT VS sddm

Found the answer after writing an email to BBT. Brightness is unfortunately set to 100% via hardware. Only way to change it is to remove R6 (0 Ohm resistor) and solder some wires with an potentiometer on it. I did that just yesterday, works pretty well but you have to use 1K or something to film it effectively. I used 10K and that is way to much. One slight turn and brightness changes to 20%. See https://github.com/bigtreetech/OctoBTT/issues/12

Well, it seems it is still considered experimental https://github.com/sddm/sddm/pull/1737

There are dozens of threads everywhere about it since around early 2021. KDE will take over the SDDM project and that bug fix may soon finally be up-streamed.

LMAO the login issue was this https://github.com/sddm/sddm/issues/1592

Wayland autologin does not work with sddm (if you're using such a configuration) https://github.com/sddm/sddm/issues/1676

Thanks everyone for your time - installing xorg-minimal solved the issue; next version should solve the issue topic discussed in sddm github. I leave the following here just in case someone with skill & time comes across - seems a bit of love would not hurt sddm: https://github.com/sddm/sddm/issues/1471

Relevant to your keyboard configuration issue: https://github.com/sddm/sddm/issues/703

Also fixed in -git

No, the picture shows that the login manager is still sddm, but somehow the login theme used by sddm has been reverted to the sddm default of the 'maui' instead of the 'breeze' theme used by default in Kubuntu. The package shipping the breeze theme (sddm-theme-breeze) may have become uninstalled, or sddm config changed somehow to not use breeze.