Manually control Mac Book Pro laptop fan from linux

laptop_fan.sh

# First su in as root
sudo su

# Then set fan control to manual mode
echo 1 > /sys/devices/platform/applesmc.768/fan1_manual

# Then set the fan speed to any value between fan1_min and fan1_max. To view these values
cat /sys/devices/platform/applesmc.768/fan1_min
cat /sys/devices/platform/applesmc.768/fan1_max

# Set the fan speed by writing to fan1_output
echo 6200 > /sys/devices/platform/applesmc.768/fan1_output

(6200 is my max fan speed)

Hi,

Thank you for sharing this code. Really helpfull to me.
Can I suggest couple of modifications? :)

#!/usr/bin/env bash

if [ "$(id -u)" != "0" ]; then
   echo "Please run $0 as root" 1>&2
   exit 1
fi

if [ $# -ne 1 ]
then
    echo "Usage:"
    echo "    $0 [fan speed value] : Set Macbook pro fan speed to manual speed "
    echo "    $0 reset             : Reset Macbook pro fan speed to kernel regulation"
else
    case $1 in
        reset)
            echo "Set to automatic fan speed scaling"
            echo 0 > /sys/devices/platform/applesmc.768/fan1_manual 
        ;;
        *)
        # check if fan is set to manual
        fan_mode=`cat /sys/devices/platform/applesmc.768/fan1_manual | xargs expr`
        if [ ${fan_mode} -eq 0 ]
        then
            # Then set fan control to manual mode
            echo 1 > /sys/devices/platform/applesmc.768/fan1_manual
            echo "Switch to manual fan control..."
        fi

        fan_min_speed=`cat /sys/devices/platform/applesmc.768/fan1_min | xargs expr`
        fan_max_speed=`cat /sys/devices/platform/applesmc.768/fan1_max | xargs expr`
        if [ $1 -ge $fan_min_speed ] && [ $1 -le $fan_max_speed ]
        then
            echo "Set fan speed to $1"
            # Set the fan speed by writing to fan1_output
            echo $1 > /sys/devices/platform/applesmc.768/fan1_output
        else
            echo "Fan speed not allowed. Please specify a value between $fan_min_speed and $fan_max_speed"
        fi
    ;;
    esac
fi

Best regards

Thanks, looks good. I haven't used Linux on my MacBook since 2015. At the time I increased/decreased the fan speed using the functions keys. I was using OpenBox back then. Here is a write up if you are interested https://gist.github.com/nwjlyons/b29ee6f7e26595f55a2a

Many thanks! Beautifull the openbox setup and the key bindings.

Bests