Configure pipewire so that hotplugging into an external display/speaker is recognized properly

flake.nix

@@ -48,7 +48,6 @@
     let
       system = "x86_64-linux";
       username = "josh";
-      profile = "desktop";
       homePath = ./. + "/users/${username}/home.nix";
 
       pkgs = import nixpkgs {
@@ -60,6 +59,7 @@
       mkHost =
         {
           host,
+          profile,
           extraModules ? [ ],
         }:
         nixpkgs.lib.nixosSystem {
@@ -79,12 +79,19 @@
     in
     {
       nixosConfigurations = {
-        laptop = mkHost { host = "laptop"; };
+        laptop = mkHost {
+          host = "laptop";
+          profile = "gaming";
+        };
 
-        vm = mkHost { host = "vm"; };
+        vm = mkHost {
+          host = "vm";
+          profile = "desktop";
+        };
 
         live = mkHost {
           host = "installation-iso";
+          profile = "desktop";
           extraModules = [
             (nixpkgs + "/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix")
             { environment.systemPackages = [ install-system.packages.${system}.default ]; }
@@ -94,7 +101,8 @@
 
       homeConfigurations.${username} = home-manager.lib.homeManagerConfiguration {
         extraSpecialArgs = {
-          inherit inputs profile username;
+          inherit inputs username;
+          profile = "desktop";
         };
         inherit pkgs;
         modules = [

hosts/installation-iso/default.nix

@@ -1,9 +1,10 @@
 {
+  profile,
   ...
 }:
 {
   imports = [
-    ../../profiles/desktop
+    ../../profiles/${profile}
 
     ../../modules/nixos
     ../../modules/drivers

hosts/laptop/default.nix

@@ -1,9 +1,10 @@
 {
+  profile,
   ...
 }:
 {
   imports = [
-    ../../profiles/desktop
+    ../../profiles/${profile}
 
     ../../modules/nixos
     ../../modules/drivers

hosts/vm/default.nix

@@ -1,9 +1,10 @@
 {
+  profile,
   ...
 }:
 {
   imports = [
-    ../../profiles/desktop
+    ../../profiles/${profile}
 
     ../../modules/nixos
     ../../modules/drivers

modules/home/battlenet.nix

@@ -0,0 +1,48 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib;
+let
+  cfg = config.modules.battlenet;
+  yq = "${pkgs.yq}/bin/yq";
+  jq = "${pkgs.jq}/bin/jq";
+in
+{
+  config = mkIf cfg.enable {
+    # Battle.net is installed manually through Lutris, which creates the game
+    # config and wine prefix outside of Home Manager's control. The Lutris
+    # installer script writes HardwareAcceleration "false" (software rendering,
+    # which breaks Battle.net's CEF UI repainting under XWayland), so patch it
+    # and the game env after every rebuild. Re-run the rebuild after installing
+    # Battle.net for these tweaks to land.
+    home.activation.battlenetClientTweaks = hm.dag.entryAfter [ "writeBoundary" ] ''
+      shopt -s nullglob
+      for game in "$HOME"/.local/share/lutris/games/battlenet*.yml; do
+        prefix=$(${yq} -r '.game.prefix // ""' "$game" 2>/dev/null) || continue
+
+        for configFile in "$prefix"/drive_c/users/*/AppData/Roaming/Battle.net/Battle.net.config; do
+          [ -e "$configFile" ] || continue
+          if [ "$(${jq} -r '.Client.HardwareAcceleration // ""' "$configFile" 2>/dev/null)" != "true" ]; then
+            ${jq} '.Client.HardwareAcceleration = "true"' "$configFile" > "$configFile.tmp" && mv "$configFile.tmp" "$configFile"
+          fi
+        done
+
+        # GE-Proton's Wayland driver breaks Battle.net's CEF window sizing and
+        # painting, and Xalia misrenders the client, so pin both off.
+        if [ "$(${yq} -r '.system.env.PROTON_USE_XALIA // ""' "$game" 2>/dev/null)" != "0" ]; then
+          ${yq} --in-place --yaml-output '.system.env.PROTON_USE_XALIA = "0"' "$game"
+        fi
+        if [ "$(${yq} -r '.system.env.WINE_SIMULATE_WRITECOPY // ""' "$game" 2>/dev/null)" != "1" ]; then
+          ${yq} --in-place --yaml-output '.system.env.WINE_SIMULATE_WRITECOPY = "1"' "$game"
+        fi
+        if [ -n "$(${yq} -r '.system.env.PROTON_ENABLE_WAYLAND // ""' "$game" 2>/dev/null)" ]; then
+          ${yq} --in-place --yaml-output 'del(.system.env.PROTON_ENABLE_WAYLAND)' "$game"
+        fi
+      done
+      shopt -u nullglob
+    '';
+  };
+}

modules/home/default.nix

@@ -3,6 +3,7 @@
 }:
 {
   imports = [
+    ./battlenet.nix
     ./direnv.nix
     ./discord.nix
     ./dictation.nix

modules/nixos/battlenet.nix

@@ -0,0 +1,23 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib;
+let
+  cfg = config.modules.battlenet;
+in
+{
+  config = mkIf cfg.enable {
+    # Battle.net games rely on 32-bit graphics libraries; Steam would
+    # normally force this on, but enable it independently as a fallback.
+    hardware.graphics.enable32Bit = mkDefault true;
+
+    environment.systemPackages = with pkgs; [
+      lutris
+      wineWow64Packages.staging
+      winetricks
+    ];
+  };
+}

modules/nixos/default.nix

@@ -3,6 +3,7 @@
 }:
 {
   imports = [
+    ./battlenet.nix
     ./boot.nix
     ./dev.nix
     ./fonts.nix

modules/nixos/pipewire.nix

@@ -19,6 +19,27 @@ in
       jack.enable = true;
     };
 
+    # Re-enable PulseAudio-style auto profile switching (ACP), since
+    # WirePlumber 0.5 disables it and never reacts to HDMI hotplug events,
+    # leaving audio stuck on analog when a dock/TV is connected.
+    services.pipewire.wireplumber.extraConfig."99-acp-auto-profile" = {
+      "monitor.alsa.rules" = [
+        {
+          matches = [
+            {
+              "device.name" = "~alsa_card.*";
+            }
+          ];
+          actions = {
+            update-props = {
+              "api.acp.auto-profile" = true;
+              "api.acp.auto-port" = true;
+            };
+          };
+        }
+      ];
+    };
+
     # Allows Pipewire to use the realtime scheduler for increased performance
     security.rtkit.enable = true;
   };

modules/options/battlenet.nix

@@ -0,0 +1,10 @@
+{
+  lib,
+  ...
+}:
+with lib;
+{
+  options.modules.battlenet = {
+    enable = mkEnableOption "Battle.net via Lutris/Wine";
+  };
+}

modules/options/default.nix

@@ -3,6 +3,7 @@
 }:
 {
   imports = [
+    ./battlenet.nix
     ./discord.nix
     ./dictation.nix
     ./dev.nix

profiles/desktop/default.nix

@@ -29,6 +29,4 @@
   modules.screenshot.enable = true;
 
   modules.tailscale.enable = true;
-
-  modules.steam.enable = true;
 }

profiles/gaming/default.nix

@@ -0,0 +1,12 @@
+{
+  ...
+}:
+{
+  imports = [
+    ../desktop
+  ];
+
+  modules.steam.enable = true;
+
+  modules.battlenet.enable = true;
+}