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|
{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.services.undervolt;
cliArgs = lib.cli.toGNUCommandLineShell {} {
inherit (cfg)
verbose
temp
;
# `core` and `cache` are both intentionally set to `cfg.coreOffset` as according to the undervolt docs:
#
# Core or Cache offsets have no effect. It is not possible to set different offsets for
# CPU Core and Cache. The CPU will take the smaller of the two offsets, and apply that to
# both CPU and Cache. A warning message will be displayed if you attempt to set different offsets.
core = cfg.coreOffset;
cache = cfg.coreOffset;
gpu = cfg.gpuOffset;
uncore = cfg.uncoreOffset;
analogio = cfg.analogioOffset;
temp-bat = cfg.tempBat;
temp-ac = cfg.tempAc;
};
in
{
options.services.undervolt = {
enable = mkEnableOption ''
Undervolting service for Intel CPUs.
Warning: This service is not endorsed by Intel and may permanently damage your hardware. Use at your own risk!
'';
verbose = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable verbose logging.
'';
};
package = mkOption {
type = types.package;
default = pkgs.undervolt;
defaultText = "pkgs.undervolt";
description = ''
undervolt derivation to use.
'';
};
coreOffset = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
The amount of voltage in mV to offset the CPU cores by.
'';
};
gpuOffset = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
The amount of voltage in mV to offset the GPU by.
'';
};
uncoreOffset = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
The amount of voltage in mV to offset uncore by.
'';
};
analogioOffset = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
The amount of voltage in mV to offset analogio by.
'';
};
temp = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
The temperature target in Celsius degrees.
'';
};
tempAc = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
The temperature target on AC power in Celsius degrees.
'';
};
tempBat = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
The temperature target on battery power in Celsius degrees.
'';
};
};
config = mkIf cfg.enable {
boot.kernelModules = [ "msr" ];
environment.systemPackages = [ cfg.package ];
systemd.services.undervolt = {
path = [ pkgs.undervolt ];
description = "Intel Undervolting Service";
serviceConfig = {
Type = "oneshot";
Restart = "no";
ExecStart = "${pkgs.undervolt}/bin/undervolt ${cliArgs}";
};
};
systemd.timers.undervolt = {
description = "Undervolt timer to ensure voltage settings are always applied";
partOf = [ "undervolt.service" ];
wantedBy = [ "multi-user.target" ];
timerConfig = {
OnBootSec = "2min";
OnUnitActiveSec = "30";
};
};
};
}
|