Re: big problem with TP-LINK WiFi card

On Sat, 10 Mar 2012 23:33:02 +0100, Bernard wrote:

Camaleón wrote:

There are many issues reported for system freezes regarding that kernel
module (ath9k), there is even a documented bug at the Linuxwireless
site:

http://linuxwireless.org/en/users/Drivers/ath9k/bugs#Hangs_with_PCI_devices_and_SMP_systems

And even on Debian BTS:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=611946

I would try with an updated kernel.


Thanks for this information. I might end up updating the kernel, but at
this stage I am still trying to understand what happens and if there is
another way to go around.

Installing an updated kernel will not hurt, you can keep the current one
(Debian Squeeze stock) and compiling (or installing from backports) a new
one.

I also have an ASUS laptop on which I installed Debian Squeeze on a
dual boot together with MSWIN XP. This laptop allows a wireless
connexion, even though nothing was installed other than what already
existed on "MSWIN-XP". Wireless connexions are fully operational, even
though they are often active for hours. I searched about the chipset
used. It appeared to be the same as on the Desktop !

lspci on the laptop (the one that works fine) says :

Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-express
rev 01

This is a PCI-Express based card.

(while on the Desktop where no wireless connexion can operate for any
longer than one or two minutes without system freeze, this is a AR9287
Wireless Network Adapter, TP-LINK TL-WN751ND)

This is a PCI based card.

As stated, both machines are on Squeeze. On the laptop where everything
works fine, kernel is 2.6.32-5-686 (Debian 2.6.32.30), while it is
Debian 2.6.32-41 on the problematic Desktop.

The afore mentioned bug was present on PCI cards while not in PCI-Express
based cards, maybe that's the difference.

***
Hangs with PCI devices and SMP systems

This issue was due to a hardware limitation on our PCI devices whereby our
device's FIFO queue got filled up and caused a loop. This issue is only present
on our 11n PCI devices, its not present on our PCI-express devices nor our
legacy 802.11abg devices.
***

I carried a few more tests on the problematic Desktop. I tested 'Wicd'
instead of 'NetworkManager'.

(...)

The problem is on the kernel module, I can't see how user space tools such can
cope with this unless getting an updated kernel/driver.

If I were to upgrade kernels, which kernel would you recommend ?

I would try with the backports one, as it's easier to install. If that also fails, I
would compile the latest stable kernel from sources available at kernel's site
(now 3.2.9).

Greetings,

--
Camaleón


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