I have Ubuntu 21.04 installed on a Raspberry Pi 4. I want to control the fan on the POE+ HAT (https://www.raspberrypi.org/products/poe-plus-hat/)
By default the fan does not spin at all. When I add
/boot/firmware/config.txt the fan works in a seemingly default mode.
But when I do
sudo dtoverlay -l there are no overlays loaded so I don’t know why it makes a difference.
Custom settings like these do not work as expected. When I add these the fan stops completely or falls back to default mode.
dtparam=poe_fan_temp0=50000 dtparam=poe_fan_temp1=58000 dtparam=poe_fan_temp2=64000 dtparam=poe_fan_temp3=68000
When I try to load the overlay
rpi-poe I get the response
* Failed to apply overlay '0_rpi-poe' (kernel) which maybe means it’s not available in this kernel?
GNU/Linux 5.11.0-1012-raspi aarch64