Comment 16 for bug 721449

This is your device:
Bus 001 Device 004: ID 0cf3:1002 Atheros Communications, Inc. TP-Link TL-WN821N v2 [Atheros AR9001U-(2)NG]

This is mine:
02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)

So I would guess (I'm far to be any kernel engineer) this is related to atheros drivers .