configs/nixos/hosts/zeus/default.nix

@@ -1,6 +1,7 @@
 {
   config,
   lib,
+  pkgs,
   ...
 }:
 # zeus — Ryzen desktop with AMD graphics.
@@ -49,7 +50,8 @@
   modules.desktop.apps.steam.enable = true;
   modules.desktop.apps.discord.enable = true;
 
-  home-manager.users.${config.user.name}.wayland.windowManager.hyprland.settings.monitor = [
+  home-manager.users.${config.user.name}.wayland.windowManager.hyprland = {
+    settings.monitor = [
       {
         output = "HDMI-A-1";
         mode = "1920x1080@120";
@@ -65,4 +67,12 @@
       }
     ];
 
+    # Legacy games use XWayland's primary output to select their launch monitor.
+    extraConfig = ''
+      hl.on("hyprland.start", function()
+        hl.exec_cmd("${lib.getExe pkgs.xrandr} --output DP-3 --primary")
+      end)
+    '';
+  };
+
 }