{ config, lib, pkgs, ... }: with lib; let cfg = config.hardware.brightnessctl; in { options = { hardware.brightnessctl = { enable = mkOption { default = false; type = types.bool; description = '' Enable brightnessctl in userspace. This will allow brightness control from users in the video group. ''; }; }; }; config = mkIf cfg.enable { services.udev.packages = with pkgs; [ brightnessctl ]; }; }