On Thu, May 24, 2018 at 11:24 AM, Michael Yartys via E1000-devel
<e1000-devel@lists.sourceforge.net> wrote:
>
>
> I also experience this issue on my Dell Latitude E6420 running Fedora 28 with 
> an Intel 82579LM.
>
> [telia@lulz ~]$ lspci | grep Ethernet
> 00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network 
> Connection (Lewisville) (rev 04)
>
> [telia@lulz ~]$ uname -a
> Linux lulz 4.16.10-300.fc28.x86_64 #1 SMP Mon May 21 14:41:48 UTC 2018 x86_64 
> x86_64 x86_64 GNU/Linux
>
> [telia@lulz ~]$ ethtool -i eno1
> driver: e1000e
> version: 3.2.6-k
> firmware-version: 0.13-3
> expansion-rom-version:
> bus-info: 0000:00:19.0
> supports-statistics: yes
> supports-test: yes
> supports-eeprom-access: yes
> supports-register-dump: yes
> supports-priv-flags: no
>
>
> Regards
> Michael

The link speed ends up being a function of what is advertised by both
ends of the link as well as the cable itself.

Do you know what modes you are advertising? You can check that by just
running "ethtool eno1". If you don't want to link at 10 you could
force 1Gb/s as the only advertised mode by running "ethtool -s eno1
advertise 20".

In addition you may want to check your cabling. In order to support a
1Gb/s link you have to have a cable with all 4 pairs fully functional.
If you don't have that you can have the speed drop to either 10Mbps or
100Mbps depending on what the link partner supports as those speeds
can work with just 2 twisted pairs instead of needing all 4.

Thanks.

- Alex

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