Basic fan control script for P40

fanctrl.sh

#!/bin/bash

# Check if running with sudo
if [ "$EUID" -ne 0 ]; then
    echo "Please run with sudo:"
    echo "sudo $0"
    exit
fi

# Enable PWM
echo 1 > /sys/class/hwmon/hwmon2/pwm2_enable

while true; do
    # Get GPU temperature
    temp=$(nvidia-smi -q -d TEMPERATURE | awk '/GPU Current Temp/ {print $5}')

    # Calculate speed based on temperature
    speed=$(awk -v temp="$temp" 'BEGIN{ speed = int(-1/(temp - 100)*2300 - 25); if(speed < 0) speed = 0; if(speed > 254) speed = 254; print speed }')

    # Write speed to hwmon file
    echo "$speed" > /sys/class/hwmon/hwmon2/pwm2

    # Log the temperature and speed
    echo "Temperature: $temp C -- Speed: $speed"

    # Wait for 5 seconds before the next iteration
    sleep 5
done