{ config, pkgs, lib, ... }:
{
  #
  # Pin CPU frequency
  #

  # https://unix.stackexchange.com/a/265611
  # See current speed of each core:
  #   watch -n.1 "grep \"^[c]pu MHz\" /proc/cpuinfo"
  #
  # https://wiki.archlinux.org/title/CPU_frequency_scaling#Userspace_tools

  # Gnome uses power-profiles-daemon wich conflicts with tlp.
  # https://discourse.nixos.org/t/cant-enable-tlp-when-upgrading-to-21-05/13435/3
  services.power-profiles-daemon.enable = false;

  services.tlp = {
    enable = true;

    # https://linrunner.de/tlp/settings/processor.html
    settings = {
      CPU_SCALING_MIN_FREQ_ON_AC = 1400000;
      CPU_SCALING_MAX_FREQ_ON_AC = 1400000;

      # Probably useless whenn setting fixed CPU freq above.
      CPU_BOOST_ON_AC = 0;
    };
  };
}