#!/bin/bash
#
# Adjust fan speed automatically.


# Location of the nvclock program.
nvclock_bin=/usr/local/bin/nvclock

# Target temperature for video card.
target_temp=50

# Value used to calculate the temperature range (+/- target_temp).
target_range=1

# Time to wait before re-checking.
sleep_time=120

# Minimum fan speed.
min_fanspeed=20

# Fan speed increment.
adj_fanspeed=5


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

let target_temp_low=target_temp-target_range
let target_temp_high=target_temp+target_range


while true
do
    temp=$(echo $($nvclock_bin --info | grep -i 'GPU temperature' | cut -d ':' -f 2))
    pwm=$(echo $($nvclock_bin --info | grep -i 'PWM duty cycle' | cut -d ':' -f 2))

    temp_val=${temp/C/}
    pwm_val=${pwm%.*}

    if [[ $temp_val -gt $target_temp_high ]]; then
        # Temperature above target, see if the fan has any more juice.
        if [[ $pwm_val -lt 100 ]]; then
            echo "Increasing GPU fan speed, temperature: $temp"
            let pwm_val+=adj_fanspeed
            if [[ $pwm_val -gt 100 ]]; then pwm_val=100; fi
            $nvclock_bin -f --fanspeed $pwm_val
        fi
    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"
            let pwm_val-=adj_fanspeed
            if [[ $pwm_val -lt $min_fanspeed ]]; then pwm_val=$min_fanspeed; fi
            $nvclock_bin -f --fanspeed $pwm_val
        fi
    fi
    sleep $sleep_time
done

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