update

configurations/host/materusPC/other/desktop/kde.nix

@@ -1,6 +1,5 @@
 { config, pkgs, lib, ... }:
 {
-  services.displayManager.defaultSession = "plasma";
 
   xdg.portal.enable = true;
   xdg.portal.wlr.enable = true;

configurations/host/materusPC/other/desktop/sddm.nix

@@ -1,5 +1,10 @@
 { config, pkgs, lib, ... }:
 let
+  plasma-materus = pkgs.writeScript "plasma-materus" ''
+  export KWIN_DRM_DEVICES="/dev/dri/by-path/pci-0000\:53\:00.0-card"
+  ${pkgs.kdePackages.plasma-workspace}/libexec/plasma-dbus-run-session-if-needed ${pkgs.kdePackages.plasma-workspace}/bin/startplasma-wayland
+  '';
+
   westonSddm = let xcfg = config.services.xserver; in  pkgs.writeText "weston.ini"
     ''
       [core]
@@ -21,7 +26,7 @@ let
       mode=1920x1080@240
 
       [output]
-      name=DP-2
+      name=DP-4
       mode=off
 
       [output]
@@ -31,6 +36,8 @@ let
     '';
 in
 {
+  services.displayManager.defaultSession = "plasma-materus";
+  
   services.displayManager.sddm.enable = true;
   services.displayManager.sddm.wayland.enable = true;
   services.displayManager.sddm.wayland.compositor = lib.mkForce "weston";
@@ -39,6 +46,17 @@ in
     "--shell=kiosk"
     "-c ${westonSddm}"
   ];
+  services.displayManager.sessionPackages = [
+  ((pkgs.writeTextDir "share/wayland-sessions/plasma-materus.desktop" ''
+    [Desktop Entry]
+    Name=Plasma (Wayland Materus)
+    Comment=Plasma Desktop with KWIN_DRM_DEVICES env
+    Exec=${plasma-materus}
+    DesktopNames=KDE
+    Type=Application
+  '')
+  .overrideAttrs (_: {passthru.providedSessions = ["plasma-materus"];})) 
+];
 
   services.displayManager.sddm.settings = {
     General = {
@@ -49,4 +67,4 @@ in
       CursorSize = "24";
     };
   };
-}
+}