Configure KDE SDDM

[QazCetelic]

This should configure the SDDM to prevent it from not rendering as described in #111 & #110.

[gridhead]

@onuralpszr, could you please take it for a spin and see if it works?

[onuralpszr]

That's not enough, because we (Fedora KDE SIG) have decided to switch SDDM/Wayland for future releases. That code change of yours can work only if you use "sddm xorg package" so you also need to swap sddm xorg one from wayland sddm package (currently Fedora 36 ships with sddm Xorg one as default). I am using in wayland mode, so that config won't work for me currently and in future as well.

For black screen situation there was a patch for handling that(#110)

Patch: https://src.fedoraproject.org/rpms/sddm/pull-request/4#request_diff

Today, I can ask for that behavior, in kde meeting (and proceed based on that) Because that request alone won't cut it. It also require reverse section (What If I uncheck or delete) so It needs to be reverse cleanly as well.

Personal note, using as a secondary card also mostly fine If you use parameters (I do all the time)