150 lines
3.9 KiB
Nix
150 lines
3.9 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.services.undervolt;
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cliArgs = lib.cli.toGNUCommandLineShell {} {
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inherit (cfg)
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verbose
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temp
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;
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# `core` and `cache` are both intentionally set to `cfg.coreOffset` as according to the undervolt docs:
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#
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# Core or Cache offsets have no effect. It is not possible to set different offsets for
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# CPU Core and Cache. The CPU will take the smaller of the two offsets, and apply that to
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# both CPU and Cache. A warning message will be displayed if you attempt to set different offsets.
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core = cfg.coreOffset;
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cache = cfg.coreOffset;
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gpu = cfg.gpuOffset;
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uncore = cfg.uncoreOffset;
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analogio = cfg.analogioOffset;
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temp-bat = cfg.tempBat;
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temp-ac = cfg.tempAc;
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};
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in
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{
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options.services.undervolt = {
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enable = mkEnableOption ''
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Undervolting service for Intel CPUs.
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Warning: This service is not endorsed by Intel and may permanently damage your hardware. Use at your own risk!
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'';
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verbose = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable verbose logging.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.undervolt;
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defaultText = "pkgs.undervolt";
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description = ''
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undervolt derivation to use.
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'';
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};
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coreOffset = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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The amount of voltage in mV to offset the CPU cores by.
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'';
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};
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gpuOffset = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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The amount of voltage in mV to offset the GPU by.
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'';
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};
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uncoreOffset = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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The amount of voltage in mV to offset uncore by.
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'';
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};
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analogioOffset = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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The amount of voltage in mV to offset analogio by.
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'';
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};
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temp = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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The temperature target in Celsius degrees.
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'';
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};
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tempAc = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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The temperature target on AC power in Celsius degrees.
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'';
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};
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tempBat = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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The temperature target on battery power in Celsius degrees.
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'';
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};
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useTimer = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to set a timer that applies the undervolt settings every 30s.
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This will cause spam in the journal but might be required for some
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hardware under specific conditions.
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Enable this if your undervolt settings don't hold.
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'';
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};
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};
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config = mkIf cfg.enable {
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boot.kernelModules = [ "msr" ];
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environment.systemPackages = [ cfg.package ];
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systemd.services.undervolt = {
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path = [ pkgs.undervolt ];
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description = "Intel Undervolting Service";
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# Apply undervolt on boot, nixos generation switch and resume
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wantedBy = [ "multi-user.target" "post-resume.target" ];
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after = [ "post-resume.target" ]; # Not sure why but it won't work without this
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serviceConfig = {
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Type = "oneshot";
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Restart = "no";
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ExecStart = "${pkgs.undervolt}/bin/undervolt ${cliArgs}";
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};
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};
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systemd.timers.undervolt = mkIf cfg.useTimer {
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description = "Undervolt timer to ensure voltage settings are always applied";
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partOf = [ "undervolt.service" ];
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wantedBy = [ "multi-user.target" ];
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timerConfig = {
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OnBootSec = "2min";
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OnUnitActiveSec = "30";
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};
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};
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};
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}
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