nixos-config/modules/power.nix

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

with rec {
  inherit (config) device deviceSpecific;
};
with deviceSpecific; {
  services.tlp = {
    enable = isLaptop;
    settings = {
      CPU_SCALING_GOVERNOR_ON_AC = "powersave";
      CPU_SCALING_GOVERNOR_ON_BAT = "powersave";
      CPU_HWP_ON_AC = "balance_performance";
      CPU_HWP_ON_BAT = "balance_power";
      CPU_BOOST_ON_AC = 1;
      CPU_BOOST_ON_BAT = 0;
      SCHED_POWERSAVE_ON_AC = 0;
      SCHED_POWERSAVE_ON_BAT = 1;
      CPU_ENERGY_PERF_POLICY_ON_AC = "balance_performance";
      CPU_ENERGY_PERF_POLICY_ON_BAT = "balance_power";
      DISK_DEVICES = "\"nvme0n1 sda\"";
      DISK_APM_LEVEL_ON_AC = "\"255 254\"";
      DISK_APM_LEVEL_ON_BAT = "\"255 254\"";
      SATA_LINKPWR_ON_BAT = "\"med_power_with_dipm max_performance\"";
      SATA_LINKPWR_ON_AC = "\"med_power_with_dipm max_performance\"";
    };
  };

  services.undervolt = lib.mkIf (device == "Dell-Laptop") {
    enable = true;
    coreOffset = -120;
    gpuOffset = -54;
  };
}