phases: Allow loosen brightness setting again

Didn't manage to do what I wanted to do for some reason, but hey,
at least ddcutils is there.

os/desktop/default.nix

@@ -1,9 +1,11 @@
 { pkgs, lib, config, ... }:
 {
   config = lib.mkIf config.frogeye.desktop.xorg {
+    boot.kernelModules = [ "i2c-dev" ]; # Allows using ddcutil
     services = {
       blueman.enable = true;
       displayManager.defaultSession = "none+i3";
+      udev.packages = with pkgs; [ ddcutil ]; # TODO Doesn't seem to help
       xserver = {
         enable = true;
         windowManager.i3.enable = true;