I too have been experiencing these problems with the Atheros 5212
Chipset (both IBM Thinkpad buildin and Netgear external PCMCIA/PCI
adapters) and network-manager when connecting to hidden access points -
though all my adapters work with K/Ubuntu 6.10. I have tried to locate
the problem, as I suspected the driver to be the problem (Ubuntu
Restricted Modules), but must admit I was suprised to find that it's the
network-manager or knetworkmanager that must be the problem.

Yesterday I tried to use wpa_supplicant from the console line instead. First I 
created a wpa_supplicant.conf file from the template under 
/usr/share/doc/wpasupplicant/templates, then :
sudo iwconfig ath0 essid MYSID
sudo wpa_supplicant -Dwext -iath0 -c/etc/wpa_supplicant.conf -dd
sudo dhclient

Works every time and after reboot too, so now I can't help suspecting
the network-manager. What's odd is that K/Ubuntu and network-manager
seems to work flawless with Intel 2915A/B/G and 2200B/G (Buildin IBM
Thinkpads) adapters against the same hidden access point.

I seems that problems much alike this have been reported in several
other bugs (often under linux-restricted-modules) in launchpad under
Ubuntu and network-manager since version 7.04, but a great deal of the
bugs unfortunately don't state which WiFi chipset is used. But why can't
network manager handle the Atheros chipset against hidden AP, when it
can handle Intels flewlessly ? - could the difference between hardware
be the reason that this bug has not yet  been solved ?.

-- 
A bug between Atheros Communications AR5212 802.11abg nic and  Ubuntus network 
applet
https://bugs.launchpad.net/bugs/111068
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact for Ubuntu.

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