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

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;
   };