Hi!

It seems like Solid doesn't recognize my wired network interface on my KDE 4.8.1.

$ solid-network listdevices
debug: network interface list contains: 0 entries

Though:
$ solid-network query status
networking: is enabled

System Monitor plasmoid works fine and I can see network ulilization.
NetworkManager plasmoid works fine as well, I can see and configure the interface.

But when I open Konqueror and type sysinfo:/ 'Unknown network status' message displays.

Can anyone help me with this issue please?

Everything here behaves like you described too. The problem is that each of those programs use different network backends. "solid-network" uses the networkmanager_fake-0.9 backend, which only reports network status and nothing more, that's why reporting status works but device listing doesn't. Plasma NM uses the full networkmanager-0.9 backend, so everything works with it. sysinfo:/ uses Solid to retrieve network status, so it is the same problem solid-network has.

The Solid API for NetworkManager is incompatible with NetworkManager-0.9 and used to cause crashes when someone tried to use it with NetworkManager-0.9. That is why I added a networkmanager_fake-0.9 to prevent the crashes and keep at least Solid::Networking::status() working. We cannot change the API during a major version (4.x) too.

Thank you for such detailed explanation!