misc/47694: USB WLAN TP-Link TL-WN821N

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>Number:         47694
>Category:       misc
>Synopsis:       USB WLAN TP-Link TL-WN821N
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    misc-bug-people
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 25 20:00:00 +0000 2013
>Originator:     Michail UA
>Release:        NetBSD 6.1RC1
>Organization:
>Environment:
NetBSD res2600.ressora 6.1_RC1 NetBSD 6.1_RC1 (GENERIC) i386
>Description:
Good afternoon!
problem with USB WLAN TP-Link TL-WN821N 
http://netbsd.gw.com/cgi-bin/man-cgi?otus+4+NetBSD-6.0+i386 definition 

dmesg ugen0
ugen0: detached
ugen: at uhub0 port 1 (addr 2) of disconnected
ugen0 at uhub0 port 1
ugen0: ATHEROS USB WLAN, rev 2.00/2.02, addr 2
and so few times

uhub0 at usb0: vendor 0x8086 UHCO root hub class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
ugen0 at uhub0 port 1
ugen0: ATHEROS USB WLAN, rev 2.00/2.02, addr 2
how to learn in what the reason and what to do?

>How-To-Repeat:
if there is a similar modem TP-Link TL-WN821N to connect it and to check
>Fix: