Script to control NVidia GPU fan under linux using nvclock

This is a modified script I found at The script didn’t work for me so I edited a little to work under shell.

This script tries to keep the GPU temperature within 1C of 54C. The max clock speed is 100% and the lowest 20%. It clocks up and down at 5% at a time at intervals of 5 seconds until the target temperature is reached.

You will need to install the proprietary driver and nvclock from your distribution’s repository.

I have added this script to my rc.local to run at boot-time in the back ground and I find it works well.

/bin/sh /$SCRIPTDIR/ >> /var/log/messages 2>&1

The script:

# Adjust fan speed automatically.
# This version by StuJordan
# Based on Version by DarkPhoinix
# Original script by Mitch Frazier

# Location of the nvclock program.

# Target temperature for video card.

# Value used to calculate the temperature range (+/- target_temp).

# Time to wait before re-checking.

# Minimum fan speed.

# Fan speed increment.

if [ "$1" ]; then target_temp=$1; fi

target_temp_low=$(expr $target_temp - $target_range)
target_temp_high=$(expr $target_temp + $target_range)

while true
    temp_val=$(echo $($nvclock_bin --info | grep -i 'GPU temperature' | cut -d ':' -f 2) | cut -d C -f 1)
#    pwm_val=$(echo $($nvclock_bin --info | grep -i 'PWM' | cut -d ':' -f 2) | cut -d " " -f 1)
     pwm_val=$(echo $($nvclock_bin --info | grep -i 'PWM' | cut -d ':' -f 2 | cut -d " " -f 2 | cut -d "%" -f 1 | cut -d "." -f 1))

    echo "Current temp is $temp_val. Current pwm is $pwm_val"
    echo "Target temp high is $target_temp_high and low is $target_temp_low"

    if [ $temp_val -gt $target_temp_high ]; then
	echo "Temperature too high"

	# Temperature above target, see if the fan has any more juice.

        if [ $pwm_val -lt 100 ]; then
            echo "Increasing GPU fan speed, temperature: $temp_val"
            pwm_val=$(expr $pwm_val + $adj_fanspeed)
            if [ $pwm_val -gt 100 ]; then pwm_val=100; fi
            $nvclock_bin -f --fanspeed $pwm_val
    elif [ $temp_val -lt $target_temp_low ]; then

# Temperature below target, lower the fan speed
# if we're not already at the minimum.

        if [ $pwm_val -gt $min_fanspeed ]; then
            echo "Decreasing GPU fan speed, temperature: $temp_val"
            pwm_val=$(expr $pwm_val - $adj_fanspeed)
            if [ $pwm_val -lt $min_fanspeed ]; then pwm_val=$min_fanspeed; fi
            $nvclock_bin -f --fanspeed $pwm_val
    sleep $sleep_time
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