Comment 14 for bug 292054

I couldn't get NetworkManager+knetworkmanager to connect at all to my wifi network (using thinkpad t42 with atheros card). It looked like wpa_supplicant was timing out. Upgrading to the PPA packages fixed the issue.

@BUGabundo: you can set mode using 'iwpriv ath0 mode x' where x is an integer specifying the protocol 1=a, 2=b, 3=g. You can check what you're currently using with 'iwconfig ath0'. Note that this is for an atheros card - substitute ath0 with your device - also your driver might not support iwpriv mode setting anyway, try 'iwpriv ath0' to get a list of your supported ioctl commands.