Comment 28 for bug 721449

I am having the same problem (With Atheros AR9285)

Info:

gleb ~ $ iwconfig wlan0
wlan0 IEEE 802.11bgn ESSID:"WLAN_6C26"
          Mode:Managed Frequency:2.422 GHz Access Point: 64:68:0C:75:6C:29
          Bit Rate=54 Mb/s Tx-Power=12 dBm
          Retry long limit:7 RTS thr:off Fragment thr:off
          Power Management:off
          Link Quality=54/70 Signal level=-56 dBm
          Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
          Tx excessive retries:1820 Invalid misc:1946 Missed beacon:0

lspci -v

02:00.0 Network controller: Atheros Communications Inc. AR9287 Wireless Network Adapter (PCI-Express) (rev 01)
 Subsystem: Foxconn International, Inc. Device e030
 Flags: bus master, fast devsel, latency 0, IRQ 16
 Memory at e8e00000 (64-bit, non-prefetchable) [size=64K]
 Capabilities: <access denied>
 Kernel driver in use: ath9k
 Kernel modules: ath9k