I confirm unstable work of AR9285:

04:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless
Network Adapter (PCI-Express) (rev 01)

Tested on clean air environments with high quality signals on access points 
from different manufacturers including mikrotik, cisco and even d-link equipped 
with atheros/realtek and other wlan modules. 
Currently: 
The strange thing is that somehow i often see the picture when ping is 
extremely unstable without any logical reasons, after few minutes of work it 
goes up to 2k miliseconds while logs keep silence and test from another laptops 
and mobile phones show that everything should be fine. I always had some 
problems related to stability of ar9285 work but current symptoms make it 
impossible to continue to work with it. I will try to get bleeding-edge 
compat-wireless and to build ath9k module with btcoex disabled, but it will 
take some time for me. By the way if i remember well current symptoms appeared 
after kernel update.

Under:

Linux uhost 3.2.0-30-generic #48-Ubuntu SMP Fri Aug 24 16:52:48 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux

root@uhost:~# modinfo ath9k
filename:       
/lib/modules/3.2.0-30-generic/kernel/drivers/net/wireless/ath/ath9k/ath9k.ko
license:        Dual BSD/GPL
description:    Support for Atheros 802.11n wireless LAN cards.
author:         Atheros Communications
srcversion:     01F684AA969715028EA1301
alias:          platform:ar934x_wmac
alias:          platform:ar933x_wmac
alias:          platform:ath9k
alias:          pci:v0000168Cd00000034sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000033sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000032sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000030sv*sd*bc*sc*i*
alias:          pci:v0000168Cd0000002Esv*sd*bc*sc*i*
alias:          pci:v0000168Cd0000002Dsv*sd*bc*sc*i*
alias:          pci:v0000168Cd0000002Csv*sd*bc*sc*i*
alias:          pci:v0000168Cd0000002Bsv*sd*bc*sc*i*
alias:          pci:v0000168Cd0000002Asv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000029sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000027sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000024sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000023sv*sd*bc*sc*i*
depends:        ath9k_hw,ath9k_common,mac80211,cfg80211,ath
intree:         Y
vermagic:       3.2.0-30-generic SMP mod_unload modversions 
parm:           debug:Debugging mask (uint)
parm:           nohwcrypt:Disable hardware encryption (int)
parm:           blink:Enable LED blink on activity (int)
parm:           btcoex_enable:Enable wifi-BT coexistence (int)

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https://bugs.launchpad.net/bugs/947697

Title:
  Atheros AR9285 Wireless on Ubuntu 12.04 is slow, unstable and has a
  weak signal.

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