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Old 06-25-2010, 05:52 PM
Enrico Weigelt
 
Default Atheros WLAN loosing link

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@excalibur.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


thx
--
---------------------------------------------------------------------
Enrico Weigelt == metux IT service - http://www.metux.de/
---------------------------------------------------------------------
Please visit the OpenSource QM Taskforce:
http://wiki.metux.de/public/OpenSource_QM_Taskforce
Patches / Fixes for a lot dozens of packages in dozens of versions:
http://patches.metux.de/
---------------------------------------------------------------------
 
Old 06-26-2010, 12:35 PM
Mick
 
Default Atheros WLAN loosing link

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@excalibur.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 ...
--
Regards,
Mick
 
Old 06-27-2010, 05:55 AM
Nagatoro
 
Default Atheros WLAN loosing link

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@excalibur.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.

/Naga
 
Old 06-27-2010, 07:21 AM
Mick
 
Default Atheros WLAN loosing link

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@excalibur.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
 
Old 06-27-2010, 08:36 AM
Feifei WU
 
Default Atheros WLAN loosing link

On Sun, Jun 27, 2010 at 3:21 PM, Mick <michaelkintzios@gmail.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@excalibur.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
 

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