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fan2go.nix
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‎desktop/l/configuration.nix‎

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# clickhouse
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./clickhouse-service.nix
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# GPU fan control
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./gpu-fan-control.nix
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#./gpu-fan-control.nix
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# Corsair fan control
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./corsair-fan-control.nix
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#./corsair-fan-control.nix
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#./docker-compose.nix
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./docker-daemon.nix
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#./smokeping.nix
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#./distributed-builds.nix
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#./hyprland.nix
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./nginx.nix
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./ollama-service.nix
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./fan2go.nix
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];
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boot = {

‎desktop/l/fan2go.nix‎

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#
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# fan2go.nix
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#
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# sudo systemctl status fan2go
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# sudo ls /var/lib/fan2go
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#
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# See also: https://github.com/arnarg/config/blob/8de65cf5f1649a4fe6893102120ede4363de9bfa/hosts/terra/fan2go.nix
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#
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{
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lib,
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config,
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pkgs,
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...
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}:
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let
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cfg = config.hardware.fan2go;
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fan2goConfig = pkgs.writeText "fan2go.yaml" ''
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#
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# fan2go.yaml
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#
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dbPath: ${cfg.dbPath}
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fans:
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# Define the fan to be controlled. This is Fan 1 on the Corsair Commander Core XT.
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- id: corsair_fan1
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# Use liquidctl to set the fan speed.
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# The fan type for external commands is `cmd`.
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# Assumes the Corsair Commander Core XT is the first device liquidctl finds.
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cmd:
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# The `setPwm` command is required. It receives a value from 0-255.
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# We use a shell command to convert the 0-255 PWM value from fan2go
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# into a 0-100 percentage for liquidctl.
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setPwm:
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exec: "/run/current-system/sw/bin/bash"
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args: ["-c", "percent=$((%pwm% * 100 / 255)); /run/current-system/sw/bin/liquidctl set fan1 speed $percent"]
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# The `getPwm` command is optional but good practice.
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# It should return a value from 0-255.
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getPwm:
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exec: "/run/current-system/sw/bin/bash"
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args: ["-c", "percent=$(/run/current-system/sw/bin/liquidctl status --json | ${pkgs.jq}/bin/jq '.[0].status[] | select(.key == \"Fan speed 1\").value | tonumber'); echo $((percent * 255 / 100))"]
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# Fan speed is a percentage for liquidctl
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min: 20
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max: 100
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## Ensures the fan never fully stops, maintaining minimum airflow.
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#neverStop: true
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# The curve ID that should be used to determine the speed of this fan.
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curve: gpu_cooling_curve
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sensors:
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# Define the temperature sensor to monitor. This is the Radeon Pro VII/MI50.
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# From `fan2go detect`, this is platform `amdgpu-pci-04400`.
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# The sensor type is `hwmon`.
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- id: gpu_mi50_temp
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hwmon:
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platform: amdgpu-pci-04400
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# Use the junction temperature (temp2_input) as it's a good indicator of core heat.
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index: 2
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curves:
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# Link the GPU temperature to the case fan speed.
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- id: gpu_cooling_curve
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# Use a linear interpolation curve based on the defined points.
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linear:
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# The sensor ID to use as a temperature input for this curve.
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sensor: gpu_mi50_temp
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# Define the temperature-to-fan-speed mapping.
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# Temps are in Celsius, fan speed is in percent.
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points:
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- [40, 20] # At 40°C, run fan at 20%
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- [50, 40] # At 50°C, run fan at 40%
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- [60, 60] # At 60°C, run fan at 60%
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- [70, 80] # At 70°C, run fan at 80%
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- [80, 100] # At 80°C and above, run fan at 100%
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statistics:
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# Whether to enable the prometheus exporter or not
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enabled: true
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# The port to expose the exporter on
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port: 9900
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'';
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in
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{
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options.hardware.fan2go = with lib; {
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enable = mkEnableOption "fan2go";
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dbPath = mkOption {
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type = types.str;
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default = "/var/lib/fan2go/fan2go.db";
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description = "The path of the database file";
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};
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};
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config = lib.mkIf cfg.enable {
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systemd.services.fan2go = {
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description = "A simple daemon providing dynamic fan speed control based on temperature sensors";
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wantedBy = [ "multi-user.target" ];
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after = [ "lm_sensors.service" ];
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serviceConfig = {
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ExecStart = lib.concatStringsSep " " [
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"${pkgs.fan2go}/bin/fan2go"
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"-c"
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"${fan2goConfig}"
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"--no-style"
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];
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LimitNOFILE = 8192;
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};
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};
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};
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}

‎desktop/l/fan2go.yml‎

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# fan2go configuration for controlling a Corsair case fan based on the
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# temperature of the Radeon Pro VII / Instinct MI50 GPU, which has no fan.
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fans:
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# Define the fan to be controlled. This is Fan 1 on the Corsair Commander Core XT.
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- id: corsair_fan1
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# Use liquidctl to set the fan speed.
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# The fan type for external commands is `cmd`.
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# Assumes the Corsair Commander Core XT is the first device liquidctl finds.
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cmd:
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# The `setPwm` command is required. It receives a value from 0-255.
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# We use a shell command to convert the 0-255 PWM value from fan2go
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# into a 0-100 percentage for liquidctl.
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setPwm:
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exec: "/run/current-system/sw/bin/bash"
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args: ["-c", "percent=$((%pwm% * 100 / 255)); /run/current-system/sw/bin/liquidctl set fan1 speed $percent"]
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# The `getPwm` command is optional but good practice.
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# It should return a value from 0-255.
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getPwm:
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exec: "/run/current-system/sw/bin/bash"
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args: ["-c", "percent=$(/run/current-system/sw/bin/liquidctl status --json | ${pkgs.jq}/bin/jq '.[0].status[] | select(.key == \"Fan speed 1\").value | tonumber'); echo $((percent * 255 / 100))"]
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# Fan speed is a percentage for liquidctl
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min: 20
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max: 100
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# Ensures the fan never fully stops, maintaining minimum airflow.
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neverStop: true
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# The curve ID that should be used to determine the speed of this fan.
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curve: gpu_cooling_curve
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sensors:
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# Define the temperature sensor to monitor. This is the Radeon Pro VII/MI50.
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# From `fan2go detect`, this is platform `amdgpu-pci-04400`.
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# The sensor type is `hwmon`.
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- id: gpu_mi50_temp
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hwmon:
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platform: amdgpu-pci-04400
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# Use the junction temperature (temp2_input) as it's a good indicator of core heat.
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index: 2
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curves:
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# Link the GPU temperature to the case fan speed.
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- id: gpu_cooling_curve
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# Use a linear interpolation curve based on the defined points.
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linear:
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# The sensor ID to use as a temperature input for this curve.
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sensor: gpu_mi50_temp
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# Define the temperature-to-fan-speed mapping.
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# Temps are in Celsius, fan speed is in percent.
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points:
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- [40, 20] # At 40°C, run fan at 20%
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- [50, 40] # At 50°C, run fan at 40%
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- [60, 60] # At 60°C, run fan at 60%
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- [70, 80] # At 70°C, run fan at 80%
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- [80, 100] # At 80°C and above, run fan at 100%
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statistics:
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# Whether to enable the prometheus exporter or not
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enabled: true
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# The port to expose the exporter on
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port: 9900
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