Custom fan speed for Dell Optiplex 7050 Micro on Fedora 37 with Intel Core i7-7700T

dell-custom-fan-speed

#!/bin/bash

export CPU_TEMP_THRESHOLD_FOR_FAN_SPEED_LOW=54
export CPU_TEMP_THRESHOLD_FOR_FAN_SPEED_HIGH=68

export SLEEP_TIME_SECS=10

export GET_CPU_TEMP_FILE=/sys/devices/platform/coretemp.0/hwmon/hwmon*/temp1_input
export SET_FAN_SPEED_FILE=/sys/devices/platform/dell_smm_hwmon/hwmon/hwmon*/pwm1

export FAN_SPEED_OFF=0
export FAN_SPEED_LOW=120
export FAN_SPEED_HIGH=250

while true; do
    current_cpu_temp=$((`cat $GET_CPU_TEMP_FILE` / 1000))

    if (( $current_cpu_temp >= $CPU_TEMP_THRESHOLD_FOR_FAN_SPEED_LOW )); then
        echo $FAN_SPEED_LOW > $SET_FAN_SPEED_FILE
        
        if (( $current_cpu_temp >= $CPU_TEMP_THRESHOLD_FOR_FAN_SPEED_HIGH )); then
            sleep 1
            echo $FAN_SPEED_HIGH > $SET_FAN_SPEED_FILE
        fi
    else
        echo $FAN_SPEED_OFF > $SET_FAN_SPEED_FILE
    fi

    sleep $SLEEP_TIME_SECS
done

dell-custom-fan-speed.service

[Unit]
Description=Custom fan speed of Dell computer using i8k driver

[Service]
Type=simple
ExecStart=/usr/local/libexec/dell-custom-fan-speed
Restart=always

[Install]
WantedBy=multi-user.target

dell_smm_hwmon-force.conf

options dell_smm_hwmon force=1

dell_smm_hwmon.conf

dell_smm_hwmon

Install files to:

• dell-custom-fan-speed → /usr/local/libexec
• dell-custom-fan-speed.service → /usr/local/lib/systemd/system
• dell_smm_hwmon.conf → /etc/modules-load.d
• dell_smm_hwmon-force.conf → /etc/modprobe.d

Enable with:

• sudo systemctl daemon-reload; sudo systemctl enable dell-custom-fan-speed.service
• sudo dracut --force (rebuild initramfs)
• reboot