Comment 5 for bug 1533721

Hi,

unfortunately, ethtool header does not currently support link speeds 25/50/100/200,
 therefore these speeds cannot be seen as dvertised/supported.

See this artical that will also expain the issue and suggest a fix.
https://lwn.net/Articles/672517/

This commit is an example of adding speeds to ethtool
b55a631d5ace86517508151dda491ffd40ad7e4b
http://lists.alioth.debian.org/pipermail/kernel-svn-changes/2015-October/021077.html