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nixpkgs/nixos/modules/services/hardware/throttled.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.throttled;
in {
options = {
services.throttled = {
enable = mkEnableOption (lib.mdDoc "fix for Intel CPU throttling");
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extraConfig = mkOption {
type = types.str;
default = "";
description = lib.mdDoc "Alternative configuration";
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};
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};
};
config = mkIf cfg.enable {
systemd.packages = [ pkgs.throttled ];
# The upstream package has this in Install, but that's not enough, see the NixOS manual
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systemd.services.lenovo_fix.wantedBy = [ "multi-user.target" ];
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environment.etc."lenovo_fix.conf".source =
if cfg.extraConfig != ""
then pkgs.writeText "lenovo_fix.conf" cfg.extraConfig
else "${pkgs.throttled}/etc/lenovo_fix.conf";
# Kernel 5.9 spams warnings whenever userspace writes to CPU MSRs.
# See https://github.com/erpalma/throttled/issues/215
boot.kernelParams =
optional (versionAtLeast config.boot.kernelPackages.kernel.version "5.9")
"msr.allow_writes=on";
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};
}