Ah, that was my missing piece. at least one of them.
Do you know, how the POE is handled?
ubus call poe info output and POE LEDs are inverted (Right-to-left) on my GS110TPP:
Port 1 POE activates LED of PORT 8, and Port1 consumption shows up on lan8 ubus.
Port 2 POE activates LED of PORT 7, and Port2 consumption shows up on lan7 ubus.
...
Port 7 POE activates LED of PORT 2, and Port7 consumption shows up on lan2 ubus.
Port 8 POE activates LED of PORT 1, and Port8 consumption shows up on lan1 ubus.
Where can I set the correct sequence? Invert the numbers in /etc/config/poe?
Edit: I inverted the IDs in /etc/config/poe. Now my ubus output is correctly reporting the consumption values, but the LEDs are still wrong as detailed above.
During bootup, the POE-LEDs are correct for the first 30 seconds or so, but just before I can login via SSH, the LEDs start misbehaving .