nixos: add throttled service

nixos/modules/module-list.nix

@@ -325,6 +325,7 @@
   ./services/hardware/tcsd.nix
   ./services/hardware/tlp.nix
   ./services/hardware/thinkfan.nix
+  ./services/hardware/throttled.nix
   ./services/hardware/trezord.nix
   ./services/hardware/triggerhappy.nix
   ./services/hardware/u2f.nix

nixos/modules/services/hardware/throttled.nix

@@ -0,0 +1,21 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.throttled;
+in {
+  options = {
+    services.throttled = {
+      enable = mkEnableOption "fix for Intel CPU throttling";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.packages = [ pkgs.throttled ];
+    # The upstream package has this in Install, but that's not enough, see the NixOS manual
+    systemd.services."lenovo_fix".wantedBy = [ "multi-user.target" ];
+
+    environment.etc."lenovo_fix.conf".source = "${pkgs.throttled}/etc/lenovo_fix.conf";
+  };
+}