Clean up gdm config and disable gdm

modules/nixos/gdm/default.nix

@@ -0,0 +1,39 @@
+{
+  # Snowfall Lib provides a customized `lib` instance with access to your flake's library
+  # as well as the libraries available from your flake's inputs.
+  lib,
+  # An instance of `pkgs` with your overlays and packages applied is also available.
+  pkgs,
+  # You also have access to your flake's inputs.
+  inputs,
+
+  # Additional metadata is provided by Snowfall Lib.
+  namespace, # The namespace used for your flake, defaulting to "internal" if not set.
+  system, # The system architecture for this host (eg. `x86_64-linux`).
+  target, # The Snowfall Lib target for this system (eg. `x86_64-iso`).
+  format, # A normalized name for the system target (eg. `iso`).
+  virtual, # A boolean to determine whether this system is a virtual target using nixos-generators.
+  systems, # An attribute map of your defined hosts.
+
+  # All other arguments come from the module system.
+  config,
+  ...
+}:
+
+let
+  cfg = config.modules.gdm;
+in
+{
+  options.modules.gdm = {
+    enable = lib.mkOption { default = false; };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.xserver.displayManager.gdm = {
+      enable = true;
+    };
+
+    # unlock GPG keyring on login
+    security.pam.services.gdm.enableGnomeKeyring = true;
+  };
+}

modules/nixos/hyprland/default.nix

@@ -33,5 +33,6 @@ in
     # programs.hyprland.package = inputs.hyprland.packages.${pkgs.system}.hyprland; # does only work with nixos-unstable
     programs.hyprland.xwayland.enable = true;
     security.pam.services.hyprlock = { };
+    services.displayManager.defaultSession = "hyprland";
   };
 }

systems/x86_64-linux/aspi/default.nix

@@ -104,15 +104,11 @@
   hardware.opengl.enable = true;
 
   services.xserver.wacom.enable = true;
-  # services.xserver.xautolock = { # TODO: does not work
-  #   enable = true;
-  #   time = 1;
-  # };
 
-  # Configure keymap in X11
   services.xserver = {
     enable = true;
-    displayManager.gdm.enable = true;
+
+    # Configure keymap in X11
     xkb.layout = "de";
     xkb.variant = "";
   };
@@ -123,8 +119,6 @@
     options = "--delete-older-than 30d";
   };
 
-  security.pam.services.gdm.enableGnomeKeyring = true;
-
   services.blueman.enable = true;
   services.upower.enable = true;