diff options
Diffstat (limited to 'nixos/modules/services/hardware/undervolt.nix')
| -rw-r--r-- | nixos/modules/services/hardware/undervolt.nix | 100 |
1 files changed, 58 insertions, 42 deletions
diff --git a/nixos/modules/services/hardware/undervolt.nix b/nixos/modules/services/hardware/undervolt.nix index e5ef0601de3..054ffa35050 100644 --- a/nixos/modules/services/hardware/undervolt.nix +++ b/nixos/modules/services/hardware/undervolt.nix @@ -1,18 +1,35 @@ { config, pkgs, lib, ... }: with lib; - let cfg = config.services.undervolt; -in { + 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 = mkOption { - type = types.bool; - default = false; - description = '' - Whether to undervolt intel cpus. - ''; - }; + 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; @@ -32,58 +49,69 @@ in { }; coreOffset = mkOption { - type = types.nullOr types.str; + type = types.nullOr types.int; default = null; description = '' - The amount of voltage to offset the CPU cores by. Accepts a floating point number. + The amount of voltage in mV to offset the CPU cores by. ''; }; gpuOffset = mkOption { - type = types.nullOr types.str; + type = types.nullOr types.int; default = null; description = '' - The amount of voltage to offset the GPU by. Accepts a floating point number. + The amount of voltage in mV to offset the GPU by. ''; }; uncoreOffset = mkOption { - type = types.nullOr types.str; + type = types.nullOr types.int; default = null; description = '' - The amount of voltage to offset uncore by. Accepts a floating point number. + The amount of voltage in mV to offset uncore by. ''; }; analogioOffset = mkOption { - type = types.nullOr types.str; + type = types.nullOr types.int; default = null; description = '' - The amount of voltage to offset analogio by. Accepts a floating point number. + The amount of voltage in mV to offset analogio by. ''; }; temp = mkOption { - type = types.nullOr types.str; + type = types.nullOr types.int; default = null; description = '' - The temperature target. Accepts a floating point number. + The temperature target in Celsius degrees. ''; }; tempAc = mkOption { - type = types.nullOr types.str; + type = types.nullOr types.int; default = null; description = '' - The temperature target on AC power. Accepts a floating point number. + The temperature target on AC power in Celsius degrees. ''; }; tempBat = mkOption { - type = types.nullOr types.str; + type = types.nullOr types.int; default = null; description = '' - The temperature target on battery power. Accepts a floating point number. + The temperature target on battery power in Celsius degrees. + ''; + }; + + useTimer = mkOption { + type = types.bool; + default = false; + description = '' + Whether to set a timer that applies the undervolt settings every 30s. + This will cause spam in the journal but might be required for some + hardware under specific conditions. + Enable this if your undervolt settings don't hold. ''; }; }; @@ -97,31 +125,19 @@ in { path = [ pkgs.undervolt ]; description = "Intel Undervolting Service"; + + # Apply undervolt on boot, nixos generation switch and resume + wantedBy = [ "multi-user.target" "post-resume.target" ]; + after = [ "post-resume.target" ]; # Not sure why but it won't work without this + 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 ${cfg.tempBat}"} - ''; + ExecStart = "${pkgs.undervolt}/bin/undervolt ${cliArgs}"; }; }; - systemd.timers.undervolt = { + systemd.timers.undervolt = mkIf cfg.useTimer { description = "Undervolt timer to ensure voltage settings are always applied"; partOf = [ "undervolt.service" ]; wantedBy = [ "multi-user.target" ]; |