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
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https://bugs.launchpad.net/bugs/721449
Title:
slow wifi (atheros [ath9k] driver issue)
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