I have just noticed that most of my systems now have their Ethernet interfaces running at 100 MBits/s half duplex rather than the expected 1GBits/s.

I think some update has caused this to happen, probably about 5 days ago (noticed something was slow). These are KDE/Plasma GUI systems but I'm not sure if this is due to a change in KDE/Plasma, NetworkManager or something else.

The KDE/Plasma NeworkManager settings GUI interface now has an "Allow auto-negotiation" checkbox which I don't think was there before and there is now the entry ETHTOOL_OPTS="autoneg on" in the /etc/sysconfig/network-scripts/ifcfg-* file if you set it. It appears that the default setting is 100MBits/s half duplex rather than auto negotiate...
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