nixpkgs/nixos/modules/hardware/video/switcheroo-control.nix

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{ config, pkgs, lib, ... }:
with lib;
let
pkg = [ pkgs.switcheroo-control ];
cfg = config.services.switcherooControl;
in {
options.services.switcherooControl = {
enable = mkEnableOption "switcheroo-control, a D-Bus service to check the availability of dual-GPU";
};
config = mkIf cfg.enable {
services.dbus.packages = pkg;
environment.systemPackages = pkg;
systemd.packages = pkg;
systemd.targets.multi-user.wants = [ "switcheroo-control.service" ];
};
}