just installed Armbian 5.38 mainline (both debian server or Ubuntu server fresh installation).
There are two processs eating cpu (kworker), and I read some other users have the same issue, but there is a solution?
Other problem: I use this board with Bluetooth dongle to monitor my solar plant. Sometimes Bluetooth dongle disappear from lsusb or hcitool scan tell me device is busy with no reason,
just unplug and reconnect usb dongle and all restart to work again (tried with two different Bluetooth dongle, this dongle works with no problem at all in another orange pi pc, no disconnection or disappear).
The power supply is the same for both orange pi pc and orange pi 5v 2A. To power banana pi I used first standard microusb connector and then sata power connector directly to power the the board (read about connector power issue).
This evening I will add the missing armbianmonitor -u output when Bluetooth is ok an when Bluetooth is not working.