BusyBox v1.33.2 (2022-10-19 16:21:10 UTC) built-in shell (ash)
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TurrisOS 6.0.3, Turris Omnia
root@turris:~# ethtool eth2
Settings for eth2:
Supported ports: [ FIBRE ]
Supported link modes: 2500baseX/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 2500baseX/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Supports Wake-on: d
Link detected: yes
As I already mentioned I doubt that the [ FIBRE ] matters to the Omnia, or at least not mine! It might matter on the other end of the cable perhaps? Are you getting all the same output as me except for link detection?
Be aware that while my 1st Omnia was set up with the TL-SM410U using HBL status OS v6, both it & my newer unit rec’d couple days ago were flashed with fresh (USB loaded) OS installs with HBS OS 6.0.3. Everything auto-configured without issue. If you can afford to start fresh it might be worthwhile to rule out oddball setting quirks. Also I so far only have my units set up as WiFi access points each using only AW7915-NP1 cards and the SFPs. All of the other interfaces are disabled.
I’d say unless your TL-SM410U has a hidden defect then your issue likely lies elsewhere!