ddcutil to control external display brightness

apps/apps-list.nix

@@ -7,6 +7,7 @@
   nixpkgs.config.allowUnfree = true;
 
   environment.systemPackages = with pkgs; [
+    ddcutil
     nix-search-cli
     alacritty
     yazi

defaults/default.nix

@@ -14,6 +14,11 @@
       fontSize = 36;
     };
   };
+  boot.kernelModules = ["i2c-dev"];
+  hardware.i2c.enable = true;
+  services.udev.extraRules = ''
+        KERNEL=="i2c-[0-9]*", GROUP="i2c", MODE="0660"
+  '';
 
   # Set your time zone.
   time.timeZone = "Europe/Moscow";

hosts/djamba.nix

@@ -44,7 +44,7 @@
   users.users.venya = {
     isNormalUser = true;
     description = "Dmitry Chumak";
-    extraGroups = [ "networkmanager" "wheel" ];
+    extraGroups = [ "networkmanager" "wheel" "i2c"];
   };