From mboxrd@z Thu Jan 1 00:00:00 1970 From: lsorense@csclub.uwaterloo.ca (Lennart Sorensen) Subject: Re: e1000e on Thinkpad x60: gigabit not available due to "SmartSpeed" Date: Fri, 2 Sep 2016 12:57:35 -0400 Message-ID: <20160902165735.GJ14311@csclub.uwaterloo.ca> References: <20160901201408.GA5061@amd> <1472767093.3889.4.camel@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Pavel Machek , kernel list , jeffrey.t.kirsher@intel.com, intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org To: Greg Return-path: Content-Disposition: inline In-Reply-To: <1472767093.3889.4.camel@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Thu, Sep 01, 2016 at 02:58:13PM -0700, Greg wrote: > On Thu, 2016-09-01 at 22:14 +0200, Pavel Machek wrote: > > Hi! > > > > I have trouble getting 1000mbit out of my ethernet card. > > > > I tried direct connection between two PCs with different cables, and > > no luck. > > > > Today I tried connection to 1000mbit switch, and no luck, either. (Two > > cables, one was cat6, both short). > > > > My computer sees 1000mbit being advertised by the other side, but does > > not advertise 1000mbit, "Link Speed was downgraded by SmartSpeed". > > Check your cables? > > https://vmxp.wordpress.com/2015/01/06/1gbe-intel-nic-throttled-to-100mbit-by-smartspeed/ Of course if it isn't the cable, then it could even be a broken pin in the port. As far as I can tell, anything that causes one of the 3rd or 4th pairs of wires to not work will degrade to 100Mbit on just the first 2 pairs of wires and give that message. Some badly implemented switches can also cause it of course. -- Len Sorensen