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Re: 1Gbps Ethernet drops to 100Mbps

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Hi Nazar,

On Wed, May 13, 2020 at 08:58:16PM +0200, Nazar Zhuk wrote:
> I have a 1Gbps network port that correctly connects as 1Gbps full duplex on
> boot, then drops to 100Mbps 4 seconds later.

Negotiation is failing and that is required for 1Gbit, so I would
start by ruling out the device that your computer is plugged into by
plugging it into something else.

A real gigabit switch would be ideal but even another gigabit port
on a computer will work well enough to show negotiation, as
auto-crossover (Auto MDI-X) is implemented on all but the most basic
gigabit chips.

If it works with other things then the conclusion is probably that
your Thunderbolt hub is junk. If it doesn't work with other things
then the conclusion is probably that your network chipset is junk.
It would be very very unlikely to be a software issue in Debian or
the kernel as negotiation is at a very low level. But if it does not
work properly with other things you could try reporting it as an
upstream kernel bug in the driver and see what happens.

Cheers,
Andy

-- 
https://bitfolk.com/ -- No-nonsense VPS hosting

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Thread

1Gbps Ethernet drops to 100Mbps Nazar Zhuk <nazar@zhuk.online> - 2020-05-13 21:00 +0200
  Re: 1Gbps Ethernet drops to 100Mbps Andy Smith <andy@strugglers.net> - 2020-05-14 08:00 +0200
  Re: 1Gbps Ethernet drops to 100Mbps Michael Stone <mstone@debian.org> - 2020-05-14 14:00 +0200
  Re: 1Gbps Ethernet drops to 100Mbps Nazar Zhuk <nazar@zhuk.online> - 2020-05-19 21:40 +0200

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