diff options
Diffstat (limited to 'nixpkgs/nixos/modules/services/hardware/undervolt.nix')
-rw-r--r-- | nixpkgs/nixos/modules/services/hardware/undervolt.nix | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/hardware/undervolt.nix b/nixpkgs/nixos/modules/services/hardware/undervolt.nix new file mode 100644 index 000000000000..e5ef0601de3c --- /dev/null +++ b/nixpkgs/nixos/modules/services/hardware/undervolt.nix @@ -0,0 +1,134 @@ +{ config, pkgs, lib, ... }: + +with lib; + +let + cfg = config.services.undervolt; +in { + options.services.undervolt = { + enable = mkOption { + type = types.bool; + default = false; + description = '' + Whether to undervolt intel cpus. + ''; + }; + + 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.str; + default = null; + description = '' + The amount of voltage to offset the CPU cores by. Accepts a floating point number. + ''; + }; + + gpuOffset = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + The amount of voltage to offset the GPU by. Accepts a floating point number. + ''; + }; + + uncoreOffset = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + The amount of voltage to offset uncore by. Accepts a floating point number. + ''; + }; + + analogioOffset = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + The amount of voltage to offset analogio by. Accepts a floating point number. + ''; + }; + + temp = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + The temperature target. Accepts a floating point number. + ''; + }; + + tempAc = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + The temperature target on AC power. Accepts a floating point number. + ''; + }; + + tempBat = mkOption { + type = types.nullOr types.str; + default = null; + description = '' + The temperature target on battery power. Accepts a floating point number. + ''; + }; + }; + + 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"; + + # `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. + ExecStart = '' + ${pkgs.undervolt}/bin/undervolt \ + ${optionalString cfg.verbose "--verbose"} \ + ${optionalString (cfg.coreOffset != null) "--core ${cfg.coreOffset}"} \ + ${optionalString (cfg.coreOffset != null) "--cache ${cfg.coreOffset}"} \ + ${optionalString (cfg.gpuOffset != null) "--gpu ${cfg.gpuOffset}"} \ + ${optionalString (cfg.uncoreOffset != null) "--uncore ${cfg.uncoreOffset}"} \ + ${optionalString (cfg.analogioOffset != null) "--analogio ${cfg.analogioOffset}"} \ + ${optionalString (cfg.temp != null) "--temp ${cfg.temp}"} \ + ${optionalString (cfg.tempAc != null) "--temp-ac ${cfg.tempAc}"} \ + ${optionalString (cfg.tempBat != null) "--temp-bat ${cfg.tempBat}"} + ''; + }; + }; + + 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"; + }; + }; + }; +} |