Same problem using Atheros AR5413 802.11abg  NIC (rev 1)

Network manager hangs around until poked with iwpriv ath0 mode 3, or
iwconfig ath0 essid MYSSID..

Alternative workaround is to set router to support g only. Since doing
this NetworkManager connects automatically, BUT now knetworkmanager
repeatedly reports that it has found a new network even though it is
already connected. suspect this is something to do with bgscan??? This
happens consistently regardless of whether the wireless SSID is hidden
or not.

kernel: 2.6.24-12-generic

iwconfig ath0

ath0      IEEE 802.11g  ESSID:"MYSID"  Nickname:""
          Mode:Managed  Frequency:2.462 GHz  Access Point: 00:AA:AA:AA:FF:FF
          Bit Rate:54 Mb/s   Tx-Power:17 dBm   Sensitivity=1/1
          Retry:off   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=54/70  Signal level=-42 dBm  Noise level=-96 dBm
          Rx invalid nwid:22169  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

lspci -v

02:03.0 Ethernet controller: Atheros Communications, Inc. AR5413 802.11abg NIC 
(rev 01)
        Subsystem: Atheros Communications, Inc. Unknown device 1062
        Flags: bus master, medium devsel, latency 168, IRQ 7
        Memory at f8fe0000 (32-bit, non-prefetchable) [size=64K]
        Capabilities: [44] Power Management version 2

dpkg -l | grep network-manager

ii  network-manager                            0.6.6-0ubuntu1               
network management framework daemon
ii  network-manager-kde                        1:0.2ubuntu1-0ubuntu12       KDE 
systray applet for controlling NetworkMa

-- 
A bug between Atheros Communications AR5212 802.11abg nic and  Ubuntus network 
applet
https://bugs.launchpad.net/bugs/111068
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