I have this problem on my laptop with a cardbus ethernet adaptor. You can see in the attached log that the card is detected and after dhcp fails it is assigned an address via avahi-autoipd. If I then plug in the cable the kernel reports a link beat and the network works as it is pre- configured. Then when I remove the cable the kernel reports the lost link beat, but network manager does nothing.
** Attachment added: "syslog" http://librarian.launchpad.net/6341606/syslog -- [feisty] nm gives me an ip even if there is no cable https://launchpad.net/bugs/78078 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
