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Old 10-20-2010, 08:03 PM
Ian MacDonald
 
Default Bug#556009: ath9k disassociates from 2.6.32-5

Package: linux-2.6
Version: 2.6.32-5
Severity: important

After upgrading to Squeeze, my ath9k is dropping its connection
intermittently.

My hardware and issues matches a bug that is apparently resolved in
current linux vanilla (per upstream comments), however persists in the
current squeeze 2.6.32-25 images.

The issue is consistent with my syslog, my hardware, and my observation
that this occurs under some load (rarely when idle) per upstream
https://bugzilla.kernel.org/show_bug.cgi?id=14267

01:0a.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network Adapter (rev 01)
Subsystem: D-Link System Inc DWA-552 802.11n Xtreme N Desktop Adapter (rev A1)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 168, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 18
Region 0: Memory at fdde0000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [40] #80 [0000]
Kernel driver in use: ath9k

I have implemented a shutdown of power management that may help per
upstream, but have yet to confirm if this workaround is effective at
all.

# iwconfig ath1 power off

The issue does not have a set frequency occurring at intervals of
minutes, hours and days.

Some syslog message samples with obfuscated mac appears as:

Oct 19 07:44:27 maple kernel: [26796.312016] No probe response from AP 00:01:46:XX:XX:XX after 500ms, disconnecting.
Oct 19 19:13:32 maple kernel: [ 6159.317018] No probe response from AP 00:01:46:XX:XX:XX after 500ms, disconnecting.
Oct 20 14:23:26 maple kernel: [75153.317020] No probe response from AP 00:01:46:XX:XX:XX after 500ms, disconnecting.

This system is running the 2.6.32-25 amd64-xen flavour.
ii xen-linux-system-2.6.32-5-xen-amd64 2.6.32-25 Xen system with Linux 2.6.32 on 64-bit PCs (meta-package)
ii wireless-tools 30~pre9-5 Tools for manipulating Linux Wireless Extensions






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Old 10-21-2010, 03:09 AM
Ben Hutchings
 
Default Bug#556009: ath9k disassociates from 2.6.32-5

On Wed, 2010-10-20 at 16:03 -0400, Ian MacDonald wrote:
> Package: linux-2.6
> Version: 2.6.32-5
> Severity: important
>
> After upgrading to Squeeze, my ath9k is dropping its connection
> intermittently.
>
> My hardware and issues matches a bug that is apparently resolved in
> current linux vanilla (per upstream comments), however persists in the
> current squeeze 2.6.32-25 images.
>
> The issue is consistent with my syslog, my hardware, and my observation
> that this occurs under some load (rarely when idle) per upstream
> https://bugzilla.kernel.org/show_bug.cgi?id=14267
[...]

I don't see any fixes there except for disabling power-saving by
default, and we have that already.

Ben.

--
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.
 
Old 10-21-2010, 12:54 PM
Ian MacDonald
 
Default Bug#556009: ath9k disassociates from 2.6.32-5

On Thu, 2010-10-21 at 04:09 +0100, Ben Hutchings wrote:
> I don't see any fixes there except for disabling power-saving by
> default, and we have that already.

After disabling power management (which I suspect may have already been
turned off by default), no change with this issue.

Oct 20 18:18:57 maple kernel: [89284.317016] No probe response from AP 00:01:46:XX:XX:XX after 500ms, disconnecting.
Oct 20 23:38:25 maple kernel: [108452.317019] No probe response from AP 00:01:46:XX:XX:XX after 500ms, disconnecting.

maple:~# iwconfig | grep "Power Management"
Power Managementff

There is no specific fix for 2.6.32 as it seems to have resolved itself
in the current kernel release and from the comments, it appears the
developers were unable to bisect to the specific commit possibly due to
build problems over the range where the problem was introduced. Knowing
this issue is pegged to Debian stable might help move that effort
forwards so I'll post upstream as well.

Would an ath9k update be considered/possible at this point if a build
against current source resolves this issue?




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Old 10-25-2010, 08:58 PM
Ben Hutchings
 
Default Bug#556009: ath9k disassociates from 2.6.32-5

On Thu, Oct 21, 2010 at 08:54:55AM -0400, Ian MacDonald wrote:
> On Thu, 2010-10-21 at 04:09 +0100, Ben Hutchings wrote:
> > I don't see any fixes there except for disabling power-saving by
> > default, and we have that already.
>
> After disabling power management (which I suspect may have already been
> turned off by default), no change with this issue.
>
> Oct 20 18:18:57 maple kernel: [89284.317016] No probe response from AP 00:01:46:XX:XX:XX after 500ms, disconnecting.
> Oct 20 23:38:25 maple kernel: [108452.317019] No probe response from AP 00:01:46:XX:XX:XX after 500ms, disconnecting.
>
> maple:~# iwconfig | grep "Power Management"
> Power Managementff
>
> There is no specific fix for 2.6.32 as it seems to have resolved itself
> in the current kernel release and from the comments, it appears the
> developers were unable to bisect to the specific commit possibly due to
> build problems over the range where the problem was introduced. Knowing
> this issue is pegged to Debian stable might help move that effort
> forwards so I'll post upstream as well.
>
> Would an ath9k update be considered/possible at this point if a build
> against current source resolves this issue?

We will only apply bug fixes and new hardware support. We will not
normally update a driver to a later upstream version because we do not
have the resources to carry out regression testing.

Ben.

--
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
- Albert Camus
 
Old 10-26-2010, 01:50 PM
Ian MacDonald
 
Default Bug#556009: ath9k disassociates from 2.6.32-5

Thanks Ben; I expected that was the case based on policy.

Contrary to my expectations, this is unresolved upstream for my hardware
combination in STA mode. I've included some details on my additional
tests upstream.




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Old 06-13-2011, 01:41 AM
Jonathan Nieder
 
Default Bug#556009: ath9k disassociates from 2.6.32-5

Hi Ian,

Ian MacDonald wrote:

> Contrary to my expectations, this is unresolved upstream for my hardware
> combination in STA mode. I've included some details on my additional
> tests upstream.

Upstream, you wrote:

> With power management disabled, this bug still exists on my AR5008 (DWA-522)
> hardware.

and said many things about a whole bunch of other Atheros chipsets .
Anyway, do you still experience this with the kernel from testing, sid
or experimental?



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