Comment 14 for bug 635475

I installed Ubuntu on a second, similar, machine, and I am experiencing this bug on the second machine as well.

The two machines are:
1. AOpen MP965 (with x64 Intel CPU)
    Intel GM965 + ICH8M Chipset

2. AOpen MP945 (with x64 Intel CPU)
    Intel 945GM + ICH7-DH Chipset

Each machine has an onboard ethernet NIC built into it.

Each has computer has a fresh install of Ubuntu 10.10 Maverick Meerkat x64.

I experience this issue randomly on each machine, and have to try my luck by rebooting to see if eth0 comes up.

I have filtered syslog by "eth0" and attached it to this report.

Some lines of syslog that I think are relevant are...

 NetworkManager[1101]: SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:19.0/net/eth0, iface: eth0)
 NetworkManager[1101]: SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:19.0/net/eth0, iface: eth0): no ifupdown configuration found.
 NetworkManager[1101]: <info> (eth0): carrier is OFF
 NetworkManager[1101]: <info> (eth0): new Ethernet device (driver: 'e1000e' ifindex: 2)
 NetworkManager[1101]: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0
 NetworkManager[1101]: <info> (eth0): now managed
 NetworkManager[1101]: <info> (eth0): device state change: 1 -> 2 (reason 2)
 NetworkManager[1101]: <info> (eth0): bringing up device.
 NetworkManager[1101]: <info> (eth0): preparing device.
 NetworkManager[1101]: <info> (eth0): deactivating device (reason: 2).
 NetworkManager[1101]: <info> Added default wired connection 'Auto eth0' for /sys/devices/pci0000:00/0000:00:19.0/net/eth0
 kernel: [ 13.171904] ADDRCONF(NETDEV_UP): eth0: link is not ready

Does anyone know what "carrier is OFF" means? (This is a desktop computer, so there is no on/off switch, as on laptop computers with wireless cards).

Also, it seems to be deactivating eth0 with "reason 2." What does "reason 2" mean?

The contents of /etc/network/interfaces is...
auto lo
iface lo inet loopback

The contents of /etc/NetworkManager/nm-system-settings.conf is...
[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false