From b3aadef8cb1de2b260507bec774e7a02c0a2f7c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Leonardo=20Eug=C3=AAnio?= <lelgenio@disroot.org>
Date: Sat, 6 Jul 2024 18:32:29 -0300
Subject: [PATCH] monolith: extract undervolt config

---
 hosts/monolith/default.nix   |  9 +--------
 hosts/monolith/undervolt.nix | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 8 deletions(-)
 create mode 100644 hosts/monolith/undervolt.nix

diff --git a/hosts/monolith/default.nix b/hosts/monolith/default.nix
index bf2771b..a0dd171 100644
--- a/hosts/monolith/default.nix
+++ b/hosts/monolith/default.nix
@@ -23,6 +23,7 @@ in
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
     ./partition.nix
+    ./undervolt.nix
   ];
   boot.initrd.availableKernelModules = [
     "nvme"
@@ -66,14 +67,6 @@ in
 
   boot.kernelPackages = pkgs.linuxPackages_6_1;
 
-  programs.corectrl = {
-    enable = true;
-    gpuOverclock = {
-      enable = true;
-      ppfeaturemask = "0xffffffff";
-    };
-  };
-
   fileSystems."/mnt/old" = {
     device = "/dev/disk/by-label/BTRFS_ROOT";
     fsType = "btrfs";
diff --git a/hosts/monolith/undervolt.nix b/hosts/monolith/undervolt.nix
new file mode 100644
index 0000000..7666a5d
--- /dev/null
+++ b/hosts/monolith/undervolt.nix
@@ -0,0 +1,16 @@
+{ pkgs, ... }:
+let
+  undervoltGpu = pkgs.writeShellScript "undervolt-gpu" ''
+    set -xe
+    cd $1
+    test -e pp_od_clk_voltage
+    echo "vo -100" > pp_od_clk_voltage
+    echo "c" > pp_od_clk_voltage
+  '';
+in
+{
+  boot.kernelParams = [ "amdgpu.ppfeaturemask=0xfffd7fff" ];
+  services.udev.extraRules = ''
+    ACTION=="add", SUBSYSTEM=="hwmon", ATTR{name}=="amdgpu", ATTR{power1_cap}="186000000", RUN+="${undervoltGpu} %S%p/device"
+  '';
+}