1 files changed, 6 insertions, 2 deletions
diff --git a/nixpkgs/nixos/modules/services/x11/display-managers/lightdm.nix b/nixpkgs/nixos/modules/services/x11/display-managers/lightdm.nix
index 479548863b47..678cade44427 100644
--- a/nixpkgs/nixos/modules/services/x11/display-managers/lightdm.nix
+++ b/nixpkgs/nixos/modules/services/x11/display-managers/lightdm.nix
@@ -132,8 +132,9 @@ in
       };
 
       background = mkOption {
-        type = types.str;
-        default = "${pkgs.nixos-artwork.wallpapers.simple-dark-gray-bottom}/share/artwork/gnome/nix-wallpaper-simple-dark-gray_bottom.png";
+        type = types.path;
+        # Manual cannot depend on packages, we are actually setting the default in config below.
+        defaultText = "pkgs.nixos-artwork.wallpapers.simple-dark-gray-bottom.gnomeFilePath";
         description = ''
           The background image or color to use.
         '';
@@ -212,6 +213,9 @@ in
       }
     ];
 
+    # Keep in sync with the defaultText value from the option definition.
+    services.xserver.displayManager.lightdm.background = mkDefault pkgs.nixos-artwork.wallpapers.simple-dark-gray-bottom.gnomeFilePath;
+
     # Set default session in session chooser to a specified values – basically ignore session history.
     # Auto-login is already covered by a config value.
     services.xserver.displayManager.job.preStart = optionalString (!cfg.autoLogin.enable && dmcfg.defaultSession != null) ''