I tried on the same old machine.  This time the NIC in it is an old
tulip (21140-based Cogent EM-110 or 100), which doesn't support carrier
detection either.  I used the Hardy i386 beta livecd (nice Heron
wallpaper, BTW):

 Everything is the same as before.  The daemon.log messages from
NetworkManager are the same as I copied/pasted in the initial bug
report.  eth0 is detected, but n-m decided not to run DHCP on it until
instructed.

 It turns out that the network connectivity applet has a left-click menu
which (in this case) has a radio button for "Wired Network", and a
"manual configuration" option.  Selecting "wired network" gives
connectivity (since the machine is on an ethernet segment with a DHCP
server).  So it's really trivial to tell n-m to use the interface _if
you know how_.


 Left clicking on something to bring up a different menu wasn't obvious to me, 
but what do I know; I usually use fluxbox and mostly run stuff from bash in a 
gnome-terminal.   I probably only right-clicked it before, which just gives an 
"Enable Networking" on/off, which is already enabled.  I would still suggest 
that at least for the live CD, defaulting to trying to activate the connection 
would be a good thing.

  I'd rate this as a wishlist bug.  AFAIK, only really old NICs don't
support carrier detection.  This tulip NIC was old 8 years ago.  People
with old hardware usually have some computer experience, at least in
this part of the world (Canada).

 Thanks,

-- 
defaults to deactivating NICs that don't support carrier detection
https://bugs.launchpad.net/bugs/176003
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