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Old 09-03-2011, 07:04 PM
Jonathan Nieder
 
Default Bug#582381: linux-image-2.6.32-bpo.3-amd64: No probe response from AP XX:XX:XX:XX:XX:XX after 500ms, disconnecting. - iwl3945

Hi Victor,

Sorry for the delay in replying.

Victor wrote:

> [ 876.781575] wlan0: associated
> [ 876.784594] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
> [ 887.552054] wlan0: no IPv6 routers present
> [ 889.304076] No probe response from AP 00:22:2d:45:34:f9 after 500ms, disconnecting.
> [ 892.717637] wlan0: direct probe to AP 00:22:2d:45:34:f9 (try 1)
> [ 892.816840] wlan0: direct probe responded
> [ 892.816849] wlan0: authenticate with AP 00:22:2d:45:34:f9 (try 1)
> [ 892.818986] wlan0: authenticated
[...]
> 03:00.0 Network controller [0280]: Intel Corporation Ultimate N WiFi Link 5300 [8086:4236]
[...]
> Kernel driver in use: iwlagn

I suspect the signal is weak. Does this always happen within a few
minutes of connecting? Does the signal strength matter? If you have
other wireless hardware to try, do they produce the same problem?
Do current kernels behave the same way? Does downgrading the kernel
to a version that worked before make it go away?

Thanks for reporting, and hope that helps,
Jonathan



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Old 09-04-2011, 06:08 PM
Victor Pablos Ceruelo
 
Default Bug#582381: linux-image-2.6.32-bpo.3-amd64: No probe response from AP XX:XX:XX:XX:XX:XX after 500ms, disconnecting. - iwl3945

Hi Jonathan,

first of all, thanks for answering my email ;-)

I found it was caused by my router, smc-7908/arcadyan ARV7518PW-A-LF-LT.
It seems to be that when signal is not good enough its implementation
only allows clients running windows os to connect.
I have a cordless phone base and when I place it near the router no
machine running linux is capable of connecting,
although some times they connect for 2-3 minutes and disconnect
showing the same error.
I've two laptops (with dual boot, windows and linux) and a computer
with a pci card (running linux).
When running windows it takes them a little bit longer to connect, but
once connected wireless works perfectly.

I fixed it just by removing the cordless phone, but maybe I can help
to find the problem. I answer your questions below.

One more thing:
iwconfig power off
this is a fix only for driver rt2500pci when it fails to enter state 1 (-16):
....
rt2500pci 0000:02:0a.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
phy0: Selected rate control algorithm 'minstrel'
Registered led device: rt2500pci-phy0::radio
Registered led device: rt2500pci-phy0::quality
....
phy0 -> rt2500pci_set_device_state: Error - Device failed to enter
state 1 (-16).
....

> I suspect the signal is weak.
When I place my laptop below the router the signal is 100%, but the
problem is still there.

> Does this always happen within a few minutes of connecting?
Not always, some times it is not capable of connecting.

> Does the signal strength matter?
I do not think so, but I'm not an expert ... ;-)

> If you have other wireless hardware to try, do they produce the same problem?
Yes. I tested on rt2500pci, Intel(R) Ultimate N WiFi Link 5300 AGN,
REV=0x24 (iwlagn)
and zd1211rw 1-6:1.0: firmware version 4725
(zd1211rw 1-6:1.0: zd1211b chip 0ace:1215 v4810 high 00-1a-ff
AL2230_RF pa0 g--NS)

> Do current kernels behave the same way?
Yes. I now have linux-image-2.6.32-5-686 (2.6.32-35) both in a laptop
and the computer, but I tested bpo kernels in both.
In the other laptop I have linux-image-2.6.39-bpo.2-amd64
(2.6.39-3~bpo60+1) and
linux-image-2.6.32-5-amd64 (2.6.32-35).
Some times they connect for 2-3 minutes and some times they do not connect.

> Does downgrading the kernel to a version that worked before make it go away?
I tried kernels in stable and forcing a downgrade of all packages from
bpo to stable, but it didn't worked.

If you think that this is caused just by the router (I think so), just
close the bug.
I do not know why windows os works, but sw inside this router is a piece of crap
and my only hope is the openwrt guys succeed in running linux on it ...

https://forum.openwrt.org/viewtopic.php?id=15934

Thanks.

On Sat, Sep 3, 2011 at 9:04 PM, Jonathan Nieder <jrnieder@gmail.com> wrote:
> Hi Victor,
>
> Sorry for the delay in replying.
>
> Victor wrote:
>
>> [ *876.781575] wlan0: associated
>> [ *876.784594] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
>> [ *887.552054] wlan0: no IPv6 routers present
>> [ *889.304076] No probe response from AP 00:22:2d:45:34:f9 after 500ms, disconnecting.
>> [ *892.717637] wlan0: direct probe to AP 00:22:2d:45:34:f9 (try 1)
>> [ *892.816840] wlan0: direct probe responded
>> [ *892.816849] wlan0: authenticate with AP 00:22:2d:45:34:f9 (try 1)
>> [ *892.818986] wlan0: authenticated
> [...]
>> 03:00.0 Network controller [0280]: Intel Corporation Ultimate N WiFi Link 5300 [8086:4236]
> [...]
>> * * * Kernel driver in use: iwlagn
>
>
>
>
> Thanks for reporting, and hope that helps,
> Jonathan
>



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Old 09-04-2011, 06:16 PM
Jonathan Nieder
 
Default Bug#582381: linux-image-2.6.32-bpo.3-amd64: No probe response from AP XX:XX:XX:XX:XX:XX after 500ms, disconnecting. - iwl3945

severity 582381 wishlist
retitle 582381 wireless: copes much worse with interference than Windows
found 582381 linux-2.6/2.6.32-35
found 582381 linux-2.6/2.6.39-3~bpo60+1
tags 582381 + upstream
quit

Hi,

Victor Pablos Ceruelo wrote:

> I found it was caused by my router, smc-7908/arcadyan ARV7518PW-A-LF-LT.
> It seems to be that when signal is not good enough its implementation
> only allows clients running windows os to connect.
> I have a cordless phone base and when I place it near the router no
> machine running linux is capable of connecting,
> although some times they connect for 2-3 minutes and disconnect
> showing the same error.
> I've two laptops (with dual boot, windows and linux) and a computer
> with a pci card (running linux).
> When running windows it takes them a little bit longer to connect, but
> once connected wireless works perfectly.

Very interesting. If you have time to pursue this, I'd recommend
contacting the linux-wireless@vger.kernel.org list to see if they have
any ideas or tests to run to figure out what Windows is doing
differently and whether Linux could learn from it.



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