a few changes

hosts/pi-car/configuration.nix

@@ -1,5 +1,6 @@
 { pkgs, ... }: {
   networking.hostName = "Pontiac-G5";
+  console.enable = false;
   systemd.services = {
     "autovt@tty1" = {
       enable = true;

hosts/pi-htpc/configuration.nix

@@ -1,18 +1,54 @@
-{ pkgs, ... }: {
+{ pkgs, ... }:
+
+let
+  kodi-with-addons = pkgs.kodi-wayland.withPackages (kodiPkgs: with kodiPkgs; [
+    inputstream-adaptive
+    bluetooth-manager
+  ]);
+in
+
+{
   networking.hostName = "htpc";
 
-  users.users.user = {
-    isNormalUser = true;
-    extraGroups = [ "audio" "video" "input" ];
+  # HDMI CEC
+  nixpkgs.overlays = [
+    (self: super: { libcec = super.libcec.override { withLibraspberrypi = true; }; })
+  ];
+  environment.systemPackages = with pkgs; [
+    libcec
+  ];
+  services.udev.extraRules = ''
+    # allow access to raspi cec device for video group (and optionally register it as a systemd device, used below)
+    KERNEL=="vchiq", GROUP="video", MODE="0660", TAG+="systemd", ENV{SYSTEMD_ALIAS}="/dev/vchiq"
+  '';
+  systemd.sockets."cec-client" = {
+    after = [ "dev-vchiq.device" ];
+    bindsTo = [ "dev-vchiq.device" ];
+    wantedBy = [ "sockets.target" ];
+    socketConfig = {
+      ListenFIFO = "/run/cec.fifo";
+      SocketGroup = "video";
+      SocketMode = "0660";
+    };
+  };
+  systemd.services."cec-client" = {
+    after = [ "dev-vchiq.device" ];
+    bindsTo = [ "dev-vchiq.device" ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      ExecStart = ''${pkgs.libcec}/bin/cec-client -d 1'';
+      ExecStop = ''/bin/sh -c "echo q > /run/cec.fifo"'';
+      StandardInput = "socket";
+      StandardOutput = "journal";
+      Restart="no";
+    };
   };
 
-  # Kodi — run as a dedicated user session
-  services.xserver.enable = true;
-  services.displayManager.autoLogin = {
-    enable = true;
-    user = "user";
-  };
-  services.xserver.desktopManager.kodi.enable = true;
+  # Kodi - run under Wayland
+  services.cage.user = "k3t";
+  services.cage.extraArguments = [ "-m" "last" ];
+  services.cage.program = "${kodi-with-addons}/bin/kodi-standalone";
+  services.cage.enable = true;  
 
   # audio
   security.rtkit.enable = true;
@@ -23,5 +59,7 @@
     pulse.enable = true;
   };
 
-  hardware.opengl.enable = true;
+  # gpu
+  hardware.raspberry-pi."4".fkms-3d.enable = true;
+  hardware.graphics.enable = true;
 }