Issue
Hi im struggling with my POE-FAN Hats for my new raspberry pi 4.
Installed several Pi's with the offical POE-HAT: https://www.raspberrypi.org/products/poe-hat/ POE works just fine, but the fans (on every raspberry) wont turn on.
I saw a lot of possible solutions, but only for raspbian OS. My goal is to have an kubernetes cluster so I installed Ubuntu Server 20.04.2 LTS
Currently my Pis have 70°C and more, so they should be warm enough.
Checked with pwmconfig and sensors-detect but both say that there are no sensors/fans available.
Does anybody can explain me how to enable the fans? And what are "healthy" temperatures for Pi 4s?
Solution
At the end of file /boot/firmware/usercnf.txt please add dtoverlay=rpi-poe
This should activate the default fan settings.
This path is /boot/firmware/config.txt for Ubuntu 21.
Then you can add custom settings like these but I must say that I never get these to work and just use the defaults, it's working for others so worth a try:
dtparam=poe_fan_temp0=50000
dtparam=poe_fan_temp1=58000
dtparam=poe_fan_temp2=64000
dtparam=poe_fan_temp3=68000
When idle my Pi's are around 50C and the room is 25C. These are normal temperatures I think.
Answered By - Thijs