Vanguard: enable gamemode with args

system/Vanguard.nix

@@ -22,6 +22,7 @@
       lutris
       cartridges
       prismlauncher
+      (writeShellScriptBin "steamscope" " gamescope -e -- steam -gamepaduid ")
     ];
     programs.obs-studio = {
       enable = true;
@@ -75,11 +76,23 @@
     steam-hardware.enable = true;
   };
   programs = {
+    gamemode.enable = true;
     steam = {
       enable = true;
       remotePlay.openFirewall = true;
       gamescopeSession.enable = true;
     };
-    gamemode.enable = true;
+    gamescope = {
+      enable = true;
+      capSysNice = true;
+      args = [
+        "-W 2560"
+        "-H 1440"
+        "-r 165"
+        "--expose-wayland"
+        "--fullscreen"
+        "--adaptive-sync"
+      ];
+    };
   };
 }

system/desktop.nix

@@ -37,6 +37,7 @@
   };
   gtk.iconCache.enable = true;
   services = {
+    dbus.packages = [ pkgs.gcr ];
     flatpak.enable = true;
     printing.enable = true;
     pipewire = {