Just to check I once set temp3 to 50000 and then the fan does ramp up to it's full speed, so it does know how to use the different speeds.

When it 'accidentally' drops below 60 and should be in the range between temp0 and temp1, the fan does not switch to a lower RPM, but just stops. So it seems like the Pi is only respecting the temp1 and temp2 settings and is using only one speed setting to stay within that range.

Here's a graphic of the above mentioned situations: Now the same happens, but the Pi is constantly between 60 and 65 degrees. Then I changes the settings to the following: # PoE Hat Fan Speeds # Then it takes the Pi some 30-ish seconds to just heat up back to 70 again and the cycle starts again, with the Pi always within 65 and 70 degrees. With these settings, the fan turns on semi-fast every 30-ish seconds around 70 degrees and stops again when it's hitting 65. This does turn on the fan, but it looks like somehow only 2 of the 4 settings are respected at the moment.įirst, I tried this setup: # PoE Hat Fan Speeds # It is running the 64-bit version of Ubuntu 21.04 Server, completely updated.Ĭontrolling the PoE+ HAT-fan should/could be done through /etc/firmware/config.txt, which I did. So I bought a new Raspberry Pi 4 (4GB) and the official PoE+ HAT.

Ubuntu fan control