I can confirm this bug on Ubuntu 10.04. I've tried:
* ath9k driver shiped with the kernel
* compat-wireless from linux-backports
* compat-wireless from linuxwireless.org (stable and bleeding edge snapshot)
and I've the same problem with each one, poor strength signal (more than
5 o 6 meters, it starts disconnecting frequently, terrible annoying),
and also, disconnects on high network load (streaming HD over youtube
for example).
Also, with the new kernel
* kernel 2.6.35 (from maverick - Ubuntu kernel team PPA)
* compat-wireless (from backports and linuxwireless.org)
the sitatuion were WORST!
Actually I'm using Ndiswrapper, it works much better and much reliable,
but sucks to use ndiswrapper instead of native ones.
Information of my machine:
$ uname -a
Linux XXXXXX 2.6.32-24-generic #42-Ubuntu SMP Fri Aug 20 14:21:58 UTC 2010
x86_64 GNU/Linux
$ lspci -nn | grep Atheros
02:00.0 Network controller [0280]: Atheros Communications Inc. AR9285 Wireless
Network Adapter (PCI-Express) [168c:002b] (rev 01)
$ lspci -vv
....
02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network
Adapter (PCI-Express) (rev 01)
Subsystem: Hewlett-Packard Company Device 303f
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+
Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 16
Region 0: Memory at d3400000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: ndiswrapper
Kernel modules: ath9k
...
$ lshw
.......
*-pci:0
description: PCI bridge
product: 5 Series/3400 Series Chipset PCI Express Root Port 1
vendor: Intel Corporation
physical id: 1c
bus info: p...@0000:00:1c.0
version: 05
width: 32 bits
clock: 33MHz
capabilities: pci bus_master cap_list
configuration: driver=pcieport
resources: irq:29 ioport:3000(size=4096) memory:d3400000-d43fffff
ioport:d0400000(size=16777216)
*-network
description: Wireless interface
product: AR9285 Wireless Network Adapter (PCI-Express)
vendor: Atheros Communications Inc.
physical id: 0
bus info: p...@0000:02:00.0
logical name: wlan0
version: 01
serial: 78:e4:00:05:3c:69
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ndiswrapper+netathwx
driverversion=1.55+,12/14/2009,7.7.0.456 ip=192.168.2.157 latency=0
multicast=yes wireless=IEEE 802.11g
resources: irq:16 memory:d3400000-d340ffff
....
--
ath9k driver not working properly with AR9285
https://bugs.launchpad.net/bugs/518818
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