nixos manuals: bring back package references

This reverts most of 89e983786a, as those references are sanitized now.
Fixes #10039, at least most of it.

The `sane` case wasn't fixed, as it calls a *function* in pkgs to get
the default value.

1 files changed, 1 insertions, 3 deletions

diff --git a/nixos/modules/services/x11/display-managers/lightdm.nix b/nixos/modules/services/x11/display-managers/lightdm.nix
index ded694d90d50..c45769119db9 100644
--- a/nixos/modules/services/x11/display-managers/lightdm.nix
+++ b/nixos/modules/services/x11/display-managers/lightdm.nix
@@ -86,6 +86,7 @@ in
       };
 
       background = mkOption {
+        default = "${pkgs.nixos-artwork}/share/artwork/gnome/Gnome_Dark.png";
         description = ''
           The background image or color to use.
         '';
@@ -151,9 +152,6 @@ in
     };
 
     users.extraGroups.lightdm.gid = config.ids.gids.lightdm;
-
-    services.xserver.displayManager.lightdm.background = mkDefault "${pkgs.nixos-artwork}/share/artwork/gnome/Gnome_Dark.png";
-
     services.xserver.tty     = null; # We might start multiple X servers so let the tty increment themselves..
     services.xserver.display = null; # We specify our own display (and logfile) in xserver-wrapper up there
   };