Hi,
Just installed the official raspberry Pi 5 active cooling fan in the Pi 5 and it spins up for a brief 5 seconds when booting, but as soon as Ubuntu appears it stops...
Any ideas how to get this working? I assumed it would remain on, is it faulty?
Using latest Ubuntu desktop
It spins up during boot and then stops because the board is... not hot? If the board is not hot, the fan will not spin. It's an actively managed cooler. If the board is cool enough, the fan doesn't spin because the board doesn't need cooling.
As the temperature of the Raspberry Pi increases, the fan reacts in the following way:
below 50°C, the fan does not spin at all (0% speed)
at 50°C, the fan turns on at a low speed (30% speed)
at 60°C, the fan speed increases to a medium speed (50% speed)
at 67.5°C, the fan speed increases to a high speed (70% speed)
at 75°C the fan increases to full speed (100% speed)
The same mapping of temperature ranges to fan speeds applies to temperature decreases as well, with a 5°C hysteresis; fan speed decreases when the temperature drops to 5°C below each of the above thresholds.
See both https://www.raspberrypi.com/documentati ... berry-pi-5 and https://www.raspberrypi.com/news/heatin ... erry-pi-5/ for a discussion of heating and cooling for discussion and documentation.
Statistics: Posted by aallan — Thu Dec 21, 2023 10:10 pm