From 2f236ee997c9cb59e009de8f4aac7508ab7499e3 Mon Sep 17 00:00:00 2001
From: zimward <zimward@zimward.moe>
Date: Tue, 21 Apr 2026 19:17:46 +0200
Subject: [PATCH] nixos/facter: enable amd-pstate for amd cpus

---
 nixos/modules/hardware/facter/amd-cpu.nix | 24 +++++++++++++++++++++++
 nixos/modules/hardware/facter/default.nix |  1 +
 2 files changed, 25 insertions(+)
 create mode 100644 nixos/modules/hardware/facter/amd-cpu.nix

diff --git a/nixos/modules/hardware/facter/amd-cpu.nix b/nixos/modules/hardware/facter/amd-cpu.nix
new file mode 100644
index 000000000000..ea779bd7d38f
--- /dev/null
+++ b/nixos/modules/hardware/facter/amd-cpu.nix
@@ -0,0 +1,24 @@
+{ lib, config, ... }:
+let
+  facterLib = import ./lib.nix lib;
+
+  inherit (config.hardware.facter) report;
+  isBaremetal = config.hardware.facter.detected.virtualisation.none.enable;
+  hasAmdCpu = facterLib.hasAmdCpu report;
+
+  kver = config.boot.kernelPackages.kernel.version;
+in
+lib.mkIf (config.hardware.facter.enable && isBaremetal && hasAmdCpu) {
+  boot = lib.mkMerge [
+    (lib.mkIf ((lib.versionAtLeast kver "5.17") && (lib.versionOlder kver "6.1")) {
+      kernelParams = [ "initcall_blacklist=acpi_cpufreq_init" ];
+      kernelModules = [ "amd-pstate" ];
+    })
+    (lib.mkIf ((lib.versionAtLeast kver "6.1") && (lib.versionOlder kver "6.3")) {
+      kernelParams = [ "amd_pstate=passive" ];
+    })
+    (lib.mkIf (lib.versionAtLeast kver "6.3") {
+      kernelParams = [ "amd_pstate=active" ];
+    })
+  ];
+}
diff --git a/nixos/modules/hardware/facter/default.nix b/nixos/modules/hardware/facter/default.nix
index a748be44d411..7174f4afe160 100644
--- a/nixos/modules/hardware/facter/default.nix
+++ b/nixos/modules/hardware/facter/default.nix
@@ -5,6 +5,7 @@
 }:
 {
   imports = [
+    ./amd-cpu.nix
     ./boot.nix
     ./bluetooth.nix
     ./camera