nixpkgs/nixos/modules/hardware/brightnessctl.nix

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{ 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 ];
};
}