On Tue, 2011-08-23 at 20:15 +0100, Paul Smith wrote:
TP-LINK TL-WN821N
Can you post output of lsmod and lsusb. Have you installed the firmware
for the device into /lib/firmware? If the device is supported by the
kernel you won't be able to load the module without the firmware
installed.
Google is your friend.