feat(orpheus): get audio working on orpheus

flake.nix

@@ -55,7 +55,7 @@
               ++ (lib.optionals (hostname == "orpheus") [
                 inputs.nixos-hardware.nixosModules.raspberry-pi-4
                 (
-                  { pkgs, ... }:
+                  { pkgs, lib, ... }:
                   {
                     fileSystems."/" = {
                       device = "/dev/disk/by-uuid/44444444-4444-4444-8888-888888888888";
@@ -75,6 +75,31 @@
                         };
                       };
                     };
+                    boot = {
+                      kernelPackages = lib.mkForce pkgs.linuxPackages_rpi4;
+                      # Thanks to https://discourse.nixos.org/t/sound-on-raspberry-pi-4/15965/9
+                      kernelParams = [
+                        "snd_bcm2835.enable_hdmi=1"
+                        "snd_bcm2835.enable_headphones=1"
+                      ];
+                      extraModprobeConfig = ''
+                        options snd_bcm2835 enable_headphones=1
+                      '';
+                    };
+                    systemd.user.services.wireplumber.wantedBy = [ "default.target" ];
+
+                    security.rtkit.enable = true;
+                    services.pipewire = {
+                      enable = true;
+                      socketActivation = false;
+                      extraConfig = { };
+                      jack.enable = true;
+                      pulse.enable = true;
+                      alsa = {
+                        enable = true;
+                        support32Bit = true;
+                      };
+                    };
                   }
                 )
               ]);

modules/boot.nix

@@ -1,6 +1,7 @@
 {
   pkgs,
   modulesPath,
+  lib,
   ...
 }:
 {
@@ -12,7 +13,7 @@
       timeout = 5;
       efi.canTouchEfiVariables = true;
     };
-    kernelPackages = pkgs.linuxPackages_latest;
+    kernelPackages = lib.mkDefault pkgs.linuxPackages_latest;
     initrd.availableKernelModules = [
       "ahci"
       "nvme"

modules/users.nix

@@ -31,9 +31,11 @@
       description = "rafiq";
       hashedPasswordFile = config.sops.secrets."rafiq/password".path;
       uid = 1000;
+      linger = true; # keep user services running
       extraGroups = [
         "networkmanager"
         "wheel"
+        "audio" # Pipewire
       ];
       openssh.authorizedKeys.keys = [
         "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILdsZyY3gu8IGB8MzMnLdh+ClDxQQ2RYG9rkeetIKq8n"