Re: [gentoo-user] Atheros WLAN loosing link

[Feifei WU]

On Sun, Jun 27, 2010 at 3:21 PM, Mick <michaelkintzios@×××××.com> wrote:

> On Sunday 27 June 2010 06:55:31 Nagatoro wrote:
> > On Saturday 26 June 2010 14.35.28 Mick wrote:
> > > On Friday 25 June 2010 18:52:18 Enrico Weigelt wrote:
> > > > Hi folks,
> > > >
> > > >
> > > > my Atheros wlan (builtin, internal intenna) is regularily
> > > > loosing link. Reproducible in various different networks.
> > > > At home, my wlan ap is about 2 meter away (within the room),
> > > > so link quality (currently 53) shouldnt be the problem.
> > > >
> > > > Does anyone know what could cause the problem ?
> > > >
> > > > # cat /proc/version
> > > >
> > > > Linux version 2.6.31-gentoo-r10 (root@×××××××××.local) \
> > > > (gcc version 4.3.4 (Gentoo 4.3.4 p1.0, pie-10.1.5) )      \
> > > > #1 SMP Wed Jun 2 00:51:13 CEST 2010
> > > >
> > > > # lspci -v
> > > > ...
> > > >
> > > > 02:00.0 Network controller: Atheros Communications Inc. AR9285
> Wireless
> > > > Network Adapter (PCI-Express) (rev 01) Subsystem: Askey Computer
> Corp.
> > > > Device 7167
> > > >
> > > >     Flags: bus master, fast devsel, latency 0, IRQ 16
> > > >     Memory at f6000000 (64-bit, non-prefetchable) [size=64K]
> > > >     Capabilities: [40] Power Management version 3
> > > >     Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit-
> > > >     Capabilities: [60] Express Legacy Endpoint, MSI 00
> > > >     Capabilities: [100] Advanced Error Reporting
> > > >     Capabilities: [140] Virtual Channel <?>
> > > >     Capabilities: [160] Device Serial Number 00-15-17-ff-ff-24-14-12
> > > >     Capabilities: [170] Power Budgeting <?>
> > > >     Kernel driver in use: ath9k
> > > >     Kernel modules: ath9k
> > > >
> > > > ...
> > > >
> > > >
> > > > Jun 25 19:36:51 excalibur kernel: wlan0: no probe response from AP
> > > > 00:23:08:86:d6:8f - disassociating Jun 25 19:36:51 excalibur
> > > > dhcpcd[10182]: wlan0: carrier lost
> > >
> > > I have seen the same problem with my internal broadcom card and of
> course
> > > a different driver.  If you check google there seem to be pages and
> > > pages of users reporting such a problem on different distros and with
> > > different makes of wireless cards.
> > >
> > > The jury's out as to what's causing this.  Is it related to modern
> cards
> > > with low power management capabilities and how this may interact with
> the
> > > kernel, or is it something to do with the tolerance built into TTL
> > > packets between the card and the AP?
> > >
> > > With regards to my card I have noticed that at home I stay connected
> for
> > > hours on end, at work it's a miracle if I stay online for longer than 5
> > > minutes (both on the same channel).  This to me says that the problem
> is
> > > one of interaction with the router, which points to tolerance on the
> TTL
> > > packets.
> > >
> > > Of course YMMV ...
> >
> > Last time I had this problem I tracked it to a conflict between
> > wpa_supplicant and the card driver. Basicly the card driver would send a
> > request to assosiate with mac 00:00:....:00 each time a new card was
> found
> > on the air and wpa_supplicatnt interpreted this as a request from the
> > driver to drop the connection. The driver folks said that this request
> > should be ignored and the wpa_supplicant folks said that this should not
> > be ignored but instead was a disconnect request. Catch 22...
> >
> > Because of this I had to use wep instead of wpa(2) for along time.
>
> I seem to recall this as a problem too, although not in my case.  At work
> there is no encryption and despite this the connection keeps dropping,
> while
> at home I use WPA2.
> --
> Regards,
> Mick
>


i have the same problem !

when i using amule to download something for a long time (maybe 1 day or
more), next day when i open firefox ,always remind me "cant connect to..."
the same as every new opening software,  but amule still downloading ..

sorry for my english .

here are something about

Linux obb 2.6.34-gentoo #1 SMP PREEMPT Thu May 20 17:44:39 CST 2010 i686
Pentium(R) Dual-Core CPU E6300 @ 2.80GHz GenuineIntel GNU/Linux

03:00.0 Ethernet controller: Atheros Communications Inc. AR2413 802.11bg NIC
(rev 01)
    Subsystem: Atheros Communications Inc. Compex Wireless 802.11 b/g
MiniPCI Adapter, Rev A1 [WLM54G]
    Flags: bus master, medium devsel, latency 168, IRQ 20
    Memory at e1500000 (32-bit, non-prefetchable) [size=64K]
    Capabilities: [44] Power Management version 2
    Kernel driver in use: ath5k
    Kernel modules: ath5k