[Bug 288827] 14.2 -> 14.3 - igb interface reports "no media" when forced to 100M full-duplex

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288827

Zhenlei Huang <zlei@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kbowling@freebsd.org,
                   |                            |zlei@FreeBSD.org

--- Comment #2 from Zhenlei Huang <zlei@FreeBSD.org> ---
There're only a few commits between 14.2 and 14.3.

```
$ git log --cherry-pick --oneline --right-only
freebsd/releng/14.2..freebsd/releng/14.3 sys/dev/e1000
6f27822152e4 dev: Use recently added improvements to PME# support to simplify
drivers
ecbef369b33a e1000: Fix vlan PCP/DEI on lem(4)
edf50670e215 e1000: Remove old itr sysctl handler
645c45e297c0 e1000: Try auto-negotiation for fixed 100 or 10 configuration
e9d4e7077489 e1000: Style txrx
3d0f59024fc0 e1000: Style pass on if_em
9a89886460b6 e1000: sysctl for TCP flag handling during TSO
c66d2795bdb5 e1000: Improve igb(4) SFP support
```

The suspicious one is 645c45e297c0 (e1000: Try auto-negotiation for fixed 100
or 10 configuration). You can try to revert that on releng/14.3 branch and
compile and test again.

Good luck with you!

Also CC Kevin who is familiar with the driver.

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