You have been subscribed to a public bug:
When running Ubuntu 11.10 on a Beagleboard XM rev B the file
/sys/class/net/eth0/carrier always contains a "1" at boot even if the
ethernet cable is not plugged in; it should contain a "0". If the cable
is inserted and then removed the value changes to "0" and from then on
it tracks cable insertion and removal correctly. So the problem is
specific to the state at boot.
Running 11.10 from the pre-packaged server (headless) images updated and
upgraded. Running wicd (headless) as the network manager. Contents of
/etc/network/interfaces do not affect behavior, but for what it's worth
this file contains only the loopback stanzas:
# The loopback network interface
auto lo
iface lo inet loopback
This bug also occurs using 11.04 though the interface name is "usb0"
instead of "eth0".
uname -a
Linux 3.0.0-17-omap #30-Ubuntu Thu Mar 8 18:16:34 UTC 2012 armv7l armv7l armv7l
GNU/Linux
auction@autoauction:~$ lsb_release -rd
Description: Ubuntu 11.10
Release: 11.10
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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Beagleboard XM: sysfs always reports carrier present for eth0 at boot
https://bugs.launchpad.net/bugs/981966
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