Hello!
I’m looking to switch to NixOS with KDE and Wayland. I have couple of complicating factors that I keep having trouble with. One of those is Nvidia card and the other is 4k144hz monitor. All these things are running smoothly on ublue kinoite but I have other little problems with that that nixos fixes for me. (I keep having rsync/rclone and other mounting related issues on kinoite but don’t see any errors in logs).
Why wayland on nvidia? Because it scales properly my displays and framerate seems to be closer to 144hz than 60hz on some tasks when just doing simple stuff on the desktop.
On x11 session my screen seems to flicker on nixos. Some other distros these are fixed after installing drivers.
Here’s my configs related to nvidia: All my nvidia related configs in my nix configs with some comments · GitHub
I know that all of these are still very work in progress but little nudge to right direction to fix my problem wouldn’t hurt 
The errors that I keep having is mainly with starting starting plasma wayland session:
“nixos kwin_wayland_wrapper [7509]: kwin_core: Applying KScreen config failed!”
And when looking at kscreen-console: qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin “xcb” in “” even though it was found
I didn’t find exact error here so that’s why I’m now posting it.
I’d like to note that I also posted to Mastodon to widen my reach a little bit more.
Thank you in advance.