fix(koumakyou): add gamemode and enable decky

spec/koumakyou/default.nix

@@ -43,6 +43,7 @@
     programs.regreet.enable = lib.mkForce true;
     jovian.steam.autoStart = lib.mkForce false;
     jovian.steam.desktopSession = lib.mkForce "sway";
+    jovian.decky-loader.enable = lib.mkForce false;
     home.plasma.enable = lib.mkForce false;
     services.greetd.settings.default_session.command = let
       cfg = config.programs.regreet;

spec/koumakyou/jovian.nix

@@ -1,4 +1,4 @@
-{ pkgs, jovian, ... }: {
+{ pkgs, lib, config, jovian, ... }: {
   imports = [
     jovian.nixosModules.jovian
   ];
@@ -17,11 +17,13 @@
   };
 
   users.home.persistApp.directories = [
-    ".steam" ".local/share/Steam" ".config/gamescope"
+    ".steam" ".local/share/Steam"
+    ".config/gamescope" ".config/hhd"
     ".kodi"
   ];
 
-  users.users.app.extraGroups = [ "networkmanager" ];
+  users.users.app.extraGroups = [ "networkmanager" "gamemode" ];
+  programs.gamemode.enable = true;
   programs.regreet.enable = false;
   home.plasma.enable = true;
   home.plasma.extraConfig = {
@@ -41,11 +43,48 @@
       jellycon
     ]))
   ];
-} // {
-  #users.users.decky.uid = 514;
-  #users.groups.decky.gid = 514;
-  #jovian.decky-loader = {
-  #  enable = true;
-  #  stateDir = "/nix/persist/decky";
-  #};
+
+  services.handheld-daemon = {
+    enable = true;
+    user = "app";
+  };
+
+  jovian.decky-loader = let
+    adjustor = pkgs.python3.pkgs.buildPythonApplication rec {
+      pname = "adjustor";
+      version = "2.1.5";
+      pyproject = true;
+
+      src = pkgs.fetchFromGitHub {
+        owner = "hhd-dev";
+        repo = pname;
+        rev = "v${version}";
+        hash = "sha256-KgeK2lC3b9VbjYmy7rD/ImODWDDx3pWIzWgNnSLJeDs=";
+      };
+
+      propagatedBuildInputs = with pkgs.python3.pkgs; [
+        setuptools
+        pyroute2
+        rich
+      ];
+
+      # This package doesn't have upstream tests.
+      doCheck = false;
+    };
+  in {
+    # ~/.steam/steam/.cef-enable-remote-debugging
+    enable = true;
+    user = "app";
+    extraPackages = with pkgs; [
+      curl unzip util-linux gnugrep procps pciutils kmod
+      ryzenadj # adjustor
+    ];
+    extraPythonPackages = pythonPackages: with pythonPackages; [
+      hid pyyaml
+      # adjustor
+    ];
+    stateDir = "/nix/persist/decky";
+  };
+
+  boot.kernelParams = lib.mkIf config.jovian.decky-loader.enable [ "iomem=relaxed" "amd_pstate=passive" ];
 }