I can confirm this with up-to-date Karmic. I just reproduced it on the
latest LiveCD to rule out configuration issues, and what I found was it
only happens with system-level connections (where 'available to all
users' is enabled).
To reproduce:
1. Right-click the nm-applet icon and choose 'edit connectinos'
2. Go to the wireless tab and find your router, click edit, and make sure
'available to all users' is enabled. Click apply.
3. While connected to your router, unplug it or switch it off.
4. After a timeout Network Manager will realize the connection is dropped and
try to reconnect. Wait until it gives up. A popup will tell you that you are
disconnected at this time.
5. Plug your router back in. Network Manager will not try to reconnect. If you
try to pick your router from the list, the 'Disconnected' notification will
immediately pop up and nothing more will happen.
One interesting thing I noticed is that the 'available to all users'
checkbox on my router was grayed out after doing this, and I couldn't
uncheck it again until after I did a 'sudo restart network-manager'.
** Changed in: network-manager (Ubuntu)
Status: Incomplete => Confirmed
--
Regression: NM now incapable of reconnecting to same wifi network after
connection interrupted
https://bugs.launchpad.net/bugs/418346
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