[ath9k-devel] D-Link DWA-547 completely freezes system

[Michael Pronath <michael.pronath@gmx.de>]

update: I re-installed Ubuntu 9.10 with 32bit kernel, and it worked.
But the bitrate was only a tenth of the one I could get in Windows 
(checked with my provider's internet speedtest website).

So I tried ndiswrapper; it achieves Windows speed, but then freezes again.

Then I removed ndiswrapper, sudo apt-get install 
linux-backports-modules-karmic, reboot -- and everything works fine and 
with high speed.  The reported bitrate of iwconfig seems to be wrong 
however; it says 11Mb/s, but my actual download bitrate is 27Mbit/s peak.

Regards,
Michael




on 01/27/2010 07:06 PM Michael Pronath wrote:
> *Khashayar Naderehvandi wrote on */Fri Jan 8 13:42:21 CET 2010 /*:
> *
>> I recently purchased a wireless-n card, namely the D-link DWA-547. It
>> has an atheros chipset and is nicely detected by the ath9k driver. I
>> have been trying to get this card working with the Ubuntu 9.10 kernel
>> (which is based on 2.6.31), as well as linux 2.6.32. I have also tried
>> Ubuntu 9.10 backport wireless modules.
>>
>> lspci reports:
>> 07:02.0 Network controller [0280]: Atheros Communications Inc. AR922X
>> Wireless Network Adapter [168c:0029] (rev 01)
>>     Subsystem: D-Link System Inc Device [1186:3a78]
>>     Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 12
>>     Memory at fbae0000 (32-bit, non-prefetchable) [size=64K]
>>     Capabilities: [44] Power Management version 2
>>     Kernel modules: ath9k
>>
>> The problem is that after a few minutes - sometimes seconds - the
>> system halts to a complete freeze where the reset button is the only
>> way out. Sometimes this happens before X has started, sometimes it
>> happens right after a connection is established. There is no way for
>> me to gather any information after the freeze and I haven't found
>> anything in the logs. So, unfortunately, at the moment I have no clue
>> as of how to provide this list with more information (and that's why
>> this ended up being an email to the list, rather than a bug report)
>
> I had the same problem with the DWA-547 that I bought yesterday.  The 
> system freezes deterministically everytime when I enter the WPA2 
> password in nm-applet.  The next time booting, nm-applet had the 
> password saved and tries to connect right away, hence it freezes 
> before the Desktop is fully up.  It is a 64bit Linux installation of 
> Ubuntu 9.10, updated yesterday.
>
> I just booted from a 32bit Ubuntu 9.10 CD; then it works and doesn't 
> freeze. So I assume it's a problem with the ath9k driver specifically 
> in the 64bit kernel. Now I'll replace my 64bit installation with the 
> 32bit one, as I have no reason to run 64bit Linux anyway.
>
> If yours is a 64bit kernel: could you try the same (boot from 32bit 
> CD) to see if things get better?
>
>
> Regards,
> Michael
>
>