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 .



** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/721449

Title:
  slow wifi

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