I recently installed Ubuntu 20.04 on an 8Gb Raspberry Pi 4, and am powering it via an official PoE Hat. It appears to be working correctly, except the dtparam overrides in /boot/firmware/usercfg.txt do not appear to have any effect.
The above overrides work correctly in Raspberry Pi OS in /boot/config.txt on several Raspberry Pi 3B's and 4's.
Code: Select all
# PoE Hat Fan Speeds dtparam=poe_fan_temp0=65000,poe_fan_temp0_hyst=5000 dtparam=poe_fan_temp1=67000,poe_fan_temp1_hyst=2000