Comment # 13 on bug 1209254 from Peter S���tterlin

I'm afraid it's the 'somewhere else' issue:

Yesterday I DUPed to latest TW (including kernel 6.2.8).
After rebooting to my 'safe' kernel 6.1.12, also that one started placing the
network card in 10Mbit mode :-o

I verified this morning, doing another reboot to 6.1.12, and the network wasn't
there.  I started suspecting the hardware, and moved the CAT cable from the
dock (Lenovo HW dock, not USB-C) to the socket of the laptop itself.
Strangely enough, it didn't recognize it (maybe because the laptop was still in
the dock - but I'm sure I had it done before that way).
When I plugged it back to the dock, network came up without problems, in
1000Mbit mode.

I rebooted to 6.2.8, first only got the 10Mbit config, but re-plugging the CAT
cable also that kernel brings the network up in 1000Mbit mode.
(I know I should have done/tested that before.  Didn't think of it :( ... )

So I'm afraid checking other kernels is futile in that situation, and it
*might* be a hardware issue of just my setup.  
As a laptop only rarely gets rebooted remotely, re-plugging is a minor thing. 
So I've lowered the severity back to normal.

Closing for now with 'WORKSFORME'.  But let me know if I should do more tests.

Thanks for looking at it, and sorry for wasting your time :-o