nixos/brightnessctl: Remove the module

Due to the support of the systemd-logind API the udev rules aren't
required anymore which renders this module useless [0].
Note: brightnessctl should now require a working D-Bus setup and a valid
local logind session for this to work.

[0]: NixOS#79663

nixos/modules/module-list.nix

@@ -41,7 +41,6 @@
   ./hardware/acpilight.nix
   ./hardware/all-firmware.nix
   ./hardware/bladeRF.nix
-  ./hardware/brightnessctl.nix
   ./hardware/brillo.nix
   ./hardware/ckb-next.nix
   ./hardware/cpu/amd-microcode.nix

nixos/modules/rename.nix

@@ -42,6 +42,12 @@ with lib;
       instead, or any other display manager in NixOS as they all support auto-login.
     '')
     (mkRemovedOptionModule [ "services" "dnscrypt-proxy" ] "Use services.dnscrypt-proxy2 instead")
+    (mkRemovedOptionModule ["hardware" "brightnessctl" ] ''
+      The brightnessctl module was removed because newer versions of
+      brightnessctl don't require the udev rules anymore (they can use the
+      systemd-logind API). Instead of using the module you can now
+      simply add the brightnessctl package to environment.systemPackages.
+    '')
 
     # Do NOT add any option renames here, see top of the file
   ];

pkgs/misc/brightnessctl/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, coreutils, pkg-config, systemd }:
+{ stdenv, fetchFromGitHub, pkg-config, systemd }:
 
 stdenv.mkDerivation rec {
   pname = "brightnessctl";
@@ -13,12 +13,6 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "PREFIX=" "DESTDIR=$(out)" "ENABLE_SYSTEMD=1" ];
 
-  postPatch = ''
-    substituteInPlace 90-brightnessctl.rules --replace /bin/ ${coreutils}/bin/
-    # For backward compatibility with the NixOS module / udev approach:
-    substituteInPlace Makefile --replace "INSTALL_UDEV_RULES=0" "INSTALL_UDEV_RULES=1"
-  '';
-
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [ systemd ];