Gnome extension brightness-control-using-ddcutil not patched

[pp5x]

Describe the bug

The extension does not work correctly because it can not find /usr/bin/ddcutil in its path. The path is hardcoded in https://github.com/daitj/gnome-display-brightness-ddcutil/blob/master/display-brightness-ddcutil%40themightydeity.github.com/extension.js#L64

The path remain unchanged on my system.

Steps To Reproduce

1. Enable gnome 3

services.xserver.displayManager.gdm.enable = true;
services.xserver.desktopManager.gnome.enable = true;

2. Enable ddcutil

environment.systemPackages = with pkgs; [
   ddcutil
   gnomeExtensions.brightness-control-using-ddcutil
];

3. Gnome extension is not working even though its detected by ddcutil

[pp5x@photon:~]$ ddcutil detect
Display 1
   I2C bus:  /dev/i2c-2
   EDID synopsis:
      Mfg id:               DEL
      Model:                DELL U2412M
      Product code:         41082
      Serial number:        Y1H5T2AT3WNL
      Binary serial number: 861359692 (0x33574e4c)
      Manufacture year:     2012,  Week: 44
   VCP version:         2.1

Side note

Should not the gnome extension also add a dependency to ddcutil and ddcutil to hardware.i2c.enable = true ?

Expected behavior

The extension should show a slider for my display.

Screenshots

Additional context

Add any other context about the problem here.

Notify maintainers

@piegamesde

Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

[pp5x@photon:~]$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 5.10.79, NixOS, 21.05.4132.24528474d2b (Okapi)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.16`
 - channels(root): `"nixos-21.05.4132.24528474d2b"`
 - channels(pp5x): `"home-manager-21.05"`
 - 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:

[piegamesde]

Interesting. See #136111, this should have been fixed in #137131. Please make sure you are using that commit and report back.

[pp5x]

My bad, indeed it is not available on the stable nixpkgs. I am closing.

Here is the fix in case someone else is running into the same beginner issue.

# configuration.nix
{ config, pkgs, ... }:

let
  unstable = import <nixos-unstable> {};
in {
  environment.systemPackages = with pkgs; [
    unstable.gnomeExtensions.brightness-control-using-ddcutil
  ];
}