#StackBounty: #kernel #raspberrypi #21.04 Ubuntu 21.04 Failed to apply overlay '0_rpi-poe' (kernel)

Bounty: 50

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 dtoverlay=rpi-poe to /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


Get this bounty!!!

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