Are you sure that you're using image for Pine64+? In the past, people mixed up Pine64 and Pine64+ images...
Thanks, the CEC problem now is fixed. I'm sure that I flashed the proper image. I don't exactly know what eth nic is connected; with "ifconfig -a" I see that the mac address start with 02:BA:A0 ; with that mac address I can't find any information about the producer. But to me doesn't seems a Realtek mac address.
If I give the command "ethtool eth0" it says to me:
Cannot get device settings: Device or resource busy
Cannot get wake-on-lan settings: Device or resource busy
Cannot get message level: Device or resource busy
Cannot get link status: Device or resource busy
No data available
Anyway I previously installed Debian official and Armbian, and the eth0 nic worked properly.
it's not a problem to continue to use the usb adapter; I'm just guessing, but I read on the web that some other people have the same problem, and they said that was related with the new linux kernel. Obviously I don't know if I have the same problem.