[ltp] 100mbit only when docked?

Henrique de Moraes Holschuh linux-thinkpad@linux-thinkpad.org
Mon, 23 Mar 2015 07:28:52 -0300

On Sun, Mar 22, 2015, at 19:11, Rubin Abdi wrote:
> I have an X220 running Debian Sid and one of those ultra mini 3 docks. I
> just noticed that e1000e can't negotiate anything beyond 100mbit when
> plugged in through the dock. If I plug it using the same cable/switch
> into the ethernet port on my laptop without the dock I can get 1000mbit
> without truoble.
> Anyone else notice this?

Thinkpad docks are not supposed to introduce so much noise as to force
the gigabit-ethernet PHY to negotiate down to fast-ethernet.  Chances
are high that something is wrong with your hardware.

Is your CAT-5e cabling and patch-cords marginal? The added noise of the
dock might push it too far in that case...

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh