machine_setup/nix/configuration/hosts/quark/power_management.nix

{
  config,
  lib,
  pkgs,
  ...
}:

{
  imports = [ ];

  environment.systemPackages = with pkgs; [
    powertop
  ];

  boot.kernelParams = [
    # Enable undervolting GPU.
    # "amdgpu.ppfeaturemask=0xfff7ffff"
  ];

  systemd.tmpfiles.rules = [
    # "w- /sys/devices/system/cpu/cpufreq/policy0/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy1/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy2/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy3/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy4/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy5/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy6/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy7/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy8/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy9/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy10/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy11/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy12/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy13/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy14/energy_performance_preference - - - - power"
    # "w- /sys/devices/system/cpu/cpufreq/policy15/energy_performance_preference - - - - power"
  ];

  # services.udev.packages = [
  #   (pkgs.writeTextFile {
  #     name = "amdgpu-low-power";
  #     text = ''
  #       ACTION=="add", SUBSYSTEM=="drm", DRIVERS=="amdgpu", ATTR{device/power_dpm_force_performance_level}="low"
  #     '';
  #     destination = "/etc/udev/rules.d/30-amdgpu-low-power.rules";
  #   })
  # ];
}