Quote Originally Posted by deano_ferrari View Post
Stay with what works. A duplex mismatch will make for an inefficient or non-working link for sure. Not sure why auto-negotiation is not working (but could be a regression with the driver itself or something strange that NM does when bringing the link up perhaps).
Many thanks for the suggestion/help. I agree to stay with what works !!

I'll make an effort to keep on eye on openSUSE forum Networks to see if others report the same sort of issue. I might still force a NetworkManager re-install. ....

It also has me thinking, if I do have a failing hard drive on this very old PC (after all this 1.5 TB drive is very old) I should start now refreshing my memory how to monitor a hard drive's health.