From 6097c89763f2268223a43f2d63009ec5f563e756 Mon Sep 17 00:00:00 2001
From: Chris Toph <toph@ryot.foo>
Date: Thu, 6 Mar 2025 19:40:27 -0500
Subject: [PATCH] Add ddcutil configuration for monitor controls

---
 hosts/common/optional/ddcutil.nix | 17 +++++++++++++++++
 hosts/nixos/rune/default.nix      |  1 +
 2 files changed, 18 insertions(+)
 create mode 100644 hosts/common/optional/ddcutil.nix

diff --git a/hosts/common/optional/ddcutil.nix b/hosts/common/optional/ddcutil.nix
new file mode 100644
index 0000000..760df8b
--- /dev/null
+++ b/hosts/common/optional/ddcutil.nix
@@ -0,0 +1,17 @@
+{ pkgs, ... }:
+{
+  environment.systemPackages = builtins.attrValues {
+    inherit (pkgs)
+      ddcutil
+      ;
+  };
+
+  # Configurations for ddcutil
+  hardware.i2c.enable = true;
+  services.udev = {
+    enable = true;
+    extraRules = ''
+      KERNEL=="i2c-[0-9]*", GROUP="i2c", MODE="0660"
+    '';
+  };
+}
diff --git a/hosts/nixos/rune/default.nix b/hosts/nixos/rune/default.nix
index e0f8956..a6dac10 100644
--- a/hosts/nixos/rune/default.nix
+++ b/hosts/nixos/rune/default.nix
@@ -30,6 +30,7 @@ in
 
       ## Optional Configs ##
       "hosts/common/optional/audio.nix" # pipewire and cli controls
+      "hosts/common/optional/ddcutil.nix" # ddcutil for monitor controls
       "hosts/common/optional/gaming.nix" # steam, gamescope, gamemode, and related hardware
       "hosts/common/optional/gnome.nix" # desktop
       "hosts/common/optional/libvirt.nix" # vm tools