Coming back from hibernation icon shows as disconnected (with wired network actually connected)

[Captain Chaos]

I have a desktop PC running Ubuntu 9.10 64-bit. It is connected to my LAN via a 1000 Mbps Ethernet adapter. It gets an IPV4 address via DHCP and an IPv6 address via router advertisements.

When the OS comes back from hibernation, the connection to the LAN is always correctly restored. I can reach the Internet and ifconfig shows the interface is up with the correct IPv4 and IPv6 address. However, the NetworkManager icon displays the "wireless disconnected" icon and the tooltip says "no network connection".

I can resolve the situation by left-clicking on the icon and selecting "Auto eth0" under "Available", which seems to bring eth0 down and then up again, after which the icon is correct. Obviously this is suboptimal, since it requires a manual action, and it interrupts my network connection.

Please let me know which further information I can provide to help debug this problem. I've noticed a few similar reports, but they all describe slightly different behaviour than this so I think it is a separate problem.

[Captain Chaos (launchpad-chaos)]

This is with version 0.8~a~git.20091014t134532.4033e62-0ubuntu1 of network-manager-gnome, and version 0.8~a~git.20091013t193206.679d548-0ubuntu1 of network-manager.

[Captain Chaos (launchpad-chaos)]

Hmmm. Annoyingly it doesn't appear to be consistent. Just now my PC came back from hibernation without exhibiting this problem.

Is there some kind of logging I can activate, so that when it happens again there will be a trail somewhere?