yarn: disable vr

etcnixos/common.nix

@@ -33,11 +33,23 @@
 
   services.kmscon.enable = true;
 
+  # Gamescope configuration for Steam Deck-like experience
+  programs = {
+    gamescope = {
+      enable = true;
+      capSysNice = true;
+    };
+    steam = {
+      enable = true;
+      gamescopeSession.enable = true;
+    };
+  };
+
   services.greetd = {
     enable = true;
     settings = {
       default_session = {
-        command = "${lib.getExe pkgs.tuigreet} --time --cmd niri-session";
+        command = "${lib.getExe pkgs.tuigreet} --sessions --time";
         user = username;
       };
       terminal.vt = lib.mkForce 2;

etcnixos/system-yarn.nix

@@ -12,7 +12,7 @@
     ./common.nix
     ./impermanence.nix
     ./no-rgb.nix
-    ./vr.nix
+    # ./vr.nix
 
     inputs.nixos-hardware.nixosModules.common-cpu-amd-pstate
     inputs.nixos-hardware.nixosModules.common-cpu-amd-zenpower

flake.nix

@@ -71,6 +71,7 @@
       lanzaboote,
       nixos-hardware,
       home-manager,
+      deploy-rs,
       ...
     }@inputs:
     let
@@ -84,23 +85,6 @@
     {
       formatter.${system} = nixpkgs.legacyPackages.${system}.nixfmt-rfc-style;
 
-      deploy-yarn = {
-        nodes.yarn = {
-          hostname = "desktop";
-          profiles.system = {
-            user = "root";
-            path = inputs.deploy-rs.lib.x86_64-linux.activate.nixos (
-              self.nixosConfigurations.yarn.config.system.build.toplevel
-            );
-            sshUser = "primary";
-            sshOpts = [
-              "-p"
-              "22"
-            ];
-          };
-        };
-      };
-
       nixosConfigurations = nixpkgs.lib.foldl' (
         config: hostname:
         config
@@ -133,5 +117,14 @@
           };
         }
       ) { } hostnames;
+
+      # Deploy-rs configuration for yarn host only
+      deploy.nodes.yarn = {
+        hostname = "desktop";
+        profiles.system = {
+          user = "root";
+          path = deploy-rs.lib.${system}.activate.nixos self.nixosConfigurations.yarn;
+        };
+      };
     };
 }

home-manager/home-yarn.nix

@@ -16,8 +16,81 @@
 
     # https://github.com/NixOS/nixpkgs/pull/339370#issuecomment-2731336341
     bs-manager
+
+    # Steam session scripts
+    (writeShellScriptBin "steam-session" ''
+      #!/usr/bin/env bash
+      set -xeuo pipefail
+
+      gamescopeArgs=(
+          --adaptive-sync  # VRR support
+          --hdr-enabled
+          --mangoapp      # performance overlay
+          --rt
+          --steam
+      )
+
+      steamArgs=(
+          -pipewire-dmabuf
+          -tenfoot
+      )
+
+      mangoConfig=(
+          cpu_temp
+          gpu_temp
+          ram
+          vram
+      )
+
+      mangoVars=(
+          MANGOHUD=1
+          MANGOHUD_CONFIG="$(IFS=,; echo "''${mangoConfig[*]}")"
+      )
+
+      export "''${mangoVars[@]}"
+      exec gamescope "''${gamescopeArgs[@]}" -- steam "''${steamArgs[@]}"
+    '')
+
+    (writeShellScriptBin "steam-session-greetd" ''
+      #!/usr/bin/env bash
+      set -xeuo pipefail
+
+      # Set environment variables for Steam gaming session
+      export STEAM_RUNTIME=1
+      export SDL_VIDEODRIVER=wayland
+      export QT_QPA_PLATFORM=wayland
+      export GDK_BACKEND=wayland
+      export XDG_CURRENT_DESKTOP=Steam
+      export XDG_SESSION_TYPE=wayland
+
+      # Kill any existing compositor
+      pkill niri || true
+
+      # Start Steam in Big Picture mode with gamescope
+      exec steam-session
+    '')
   ];
 
+  # Create desktop entry for Steam session
+  xdg.dataFile."wayland-sessions/steam-session.desktop".text = ''
+    [Desktop Entry]
+    Name=Steam Session
+    Comment=Steam Deck-like gaming session with gamescope
+    Exec=${config.home.homeDirectory}/.nix-profile/bin/steam-session-greetd
+    Type=Application
+    DesktopNames=steam
+  '';
+
+  # Create desktop entry for Niri session
+  xdg.dataFile."wayland-sessions/niri-session.desktop".text = ''
+    [Desktop Entry]
+    Name=Niri Session
+    Comment=Niri Wayland compositor
+    Exec=${config.programs.niri.package}/bin/niri-session
+    Type=Application
+    DesktopNames=niri
+  '';
+
   programs.obs-studio = {
     enable = true;
     plugins = with pkgs.obs-studio-plugins; [