There was a bug in NM which was fixed[0]. I guess you have this one.

[0] https://bugzilla.gnome.org/show_bug.cgi?id=764332

On Fri, Apr 1, 2016 at 5:58 PM Samuel Sieb <samuel@sieb.net> wrote:
On 04/01/2016 07:48 AM, Russel Winder wrote:
> The latest NetworkManager upgrade appears to have fixed the WiFi
> connection on the T500, which is great :-)
>
> And, it now automatically detects the RJ45 wired Ethernet and responds
> properly. Double yay! :-))
>
> I guess the proposed experimenting is now redundant, or is it worth
> trying anyway?
>
Only if you want to create a baseline in case something happens again.

One command that should know about is "journalctl -f".  This gives you a
live stream of log entries as they happen.  Very useful for this case.
When that is running, you can see immediately if anything happens when
you plug or unplug the ethernet cable.
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