Create NVFanControl.nix

NVFanControl.nix

@@ -0,0 +1,38 @@
+{ pkgs, ... }:
+
+
+{
+
+systemd.timers.NVFanControl = {
+ wantedBy = [ "timers.target" ];
+ timerConfig = {
+ OnBootSec = "1s";
+ OnUnitActiveSec = "1s";
+ };
+};
+
+systemd.services.NVFanControl = {
+ enable = true;
+ description = "NVIDIA Fan Control Bash Script";
+ serviceConfig = { Type = "oneshot"; };
+ path = [pkgs.gawk]; #used for sine wave curve calc
+ wantedBy = [ "default.target" ];
+ partOf = ["default.target" ];
+ script = ''
+ declare -i gpuTemp
+ declare -i gpuTempFloor
+ declare -i gpuTempCeiling
+ declare -i targetFanSpeed
+ declare -i fallbackFanSpeed
+
+ gpuTemp=$(/run/current-system/sw/bin/nvidia-settings -q gpucoretemp -c 0 2> /dev/null | grep -Po "(?<=: )[0-9]+(?=\.)")
+ gpuTempFloor=$((gpuTemp<50 ? 50 : gpuTemp)) #minimum bound of fan curve
+ gpuTempCeiling=$((gpuTempFloor>80 ? 80 : gpuTempFloor)) #maximum bound of fan curve
+ targetFanSpeed=$(gawk -v temp=$gpuTempCeiling 'BEGIN{printf "%.0f", 35 * sin((temp-1.5)/10)+65}') #calculate the target fan speed based on a sine curve from x=50 to x=80. round to the nearest whole number.
+ finalFanSpeed=$((targetFanSpeed>=30 && targetFanSpeed<=100 ? targetFanSpeed : 100)) #if a valid fan target wasn't calculated, turn fans on 100% as a safety measure
+
+ echo "Current Temp: $gpuTemp | Target Fan Speed: $finalFanSpeed"
+ /run/current-system/sw/bin/nvidia-settings -a GPUTargetFanSpeed="$finalFanSpeed" -c 0
+ '';
+ };
+}