From the man page:

The X Window System (X11) provides the basis of NixOS’ graphical user interface. It can be enabled as follows:

services.xserver.enable = true;

From the default generated configuration.nix:

# Enable the X11 windowing system.
services.xserver.enable = true;

The file is also located in nixos/modules/services/x11/xserver.nix

BUT

I need to set services.xserver.enable = true, even though I use Gnome on Wayland without any X11 running. The name xserver and its relation to the X11 configuration is really misleading

Additional context

I was wondering why my GUI wasn't showing up until I found out that I must set services.xserver.enable = true;.

Notify maintainers

Didn't find any.

Metadata

• system: "x86_64-linux"
• host os: Linux 5.4.54, NixOS, 20.03.2685.977000f149b (Markhor)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.3.6
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:
# a list of nixos modules affected by the problem
module: `services.xserver`