Still have that problem : I have a network with cells on channel 10 and
3, and NWM just switch between allmost all *other* channels and gives up
after a while when deactivating it and typing

sudo ifconfig ath0 down
sudo iwconfig ath0 chanel 10
sudo iwconfig ath0 essid "My Essid"
sudo ifconfig ath0 up
sudo dhclient ath0

it just work as soon as I finish entering these commands.

I'm not really sure on how NWM is working, but I think it tries to
locate what wireless network has the strongest signal and if it has the
required information to connect on it (it means that if the network is
wep or wpa protected it probably do not tries it untill it has the key
recorded somewhere) and then uses iwconfig and ifconfig to configure the
interface correctly. If so then I assume there is a problem in detecting
the correct channel of the strongest network, or an inability to decie
between to equivalent strength with same essid and different channels.

-- 
Z.

-- 
NetworkManager is unable to associate to wireless AP
https://bugs.launchpad.net/bugs/122761
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Bugs, which is the bug contact for Ubuntu.

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