Raspberry Pi config.txt file with settings for PWM fan

config.txt

# For more options and information see
# https://www.raspberrypi.com/documentation/computers/config_txt.html

# When enabled, increases the default turbo-mode clock from 1.5GHz to 1.8GHz
# https://www.raspberrypi.com/documentation/computers/config_txt.html#arm_boost
arm_boost=1

# Enable serial console
# https://www.raspberrypi.com/documentation/computers/config_txt.html#enable_uart
enable_uart=1

# Enable the KMS ("full" KMS) graphics overlay, leaving GPU memory as the
# default (the kernel is in control of graphics memory with full KMS)
dtoverlay=vc4-fkms-v3d
disable_fw_kms_setup=1

# START FAN RULES
# Info at
# - https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README
# - https://github.com/raspberrypi/linux/issues/4632#issuecomment-1122687644
# - https://www.jeffgeerling.com/blog/2021/controlling-pwm-fans-raspberry-pi-cm4-io-boards-emc2301
# Enable I2C bus 1.
dtparam=i2c_vc=on
dtoverlay=i2c-fan,emc2301,midtemp=40000,maxtemp=55000
# END FAN RULES

Place this file inside the boot partition located at /boot/firmware/.

This config:

• enables a little turbo-mode to increase from 1.5GHz to 1.8GHz
• enables the serial console
• improves graphics performance
• enables PWM fan rules