Subject: Re: linux 3.2-rcX iwlwifi driver's problem (wifi link unstable
 when moving between multiple APs)
From: wwguy <wey-yi.w.guy@intel.com>
To: Cheng Renquan <crquan@gmail.com>
Cc: "sedat.dilek@gmail.com" <sedat.dilek@gmail.com>,
	Intel Linux Wireless <ilw@linux.intel.com>,
	"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
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Content-Type: text/plain; charset="UTF-8"
Date: Wed, 11 Jan 2012 08:37:47 -0800
Message-ID: <1326299867.25784.41.camel@wwguy-ubuntu> (sfid-20120111_174521_844223_4923AF80)
Mime-Version: 1.0
Sender: linux-wireless-owner@vger.kernel.org

Hi Renquan,

On Tue, 2012-01-10 at 17:30 -0800, Cheng Renquan wrote:
> On Tue, Jan 10, 2012 at 3:20 PM, Guy, Wey-Yi <wey-yi.w.guy@intel.com> wrote:
> > Hi Cheng,
> 
> > Got it, very sorry for the problem you experience, yes, I agree with
> > you, it might be because the noisy environment. Could you please send me
> > the dmesg log with the following flags
> >
> > $sudo modprobe iwlwifi debug=0x1083
> >
> > Thanks
> > Wey
> 
> Attached iwlwifi-debug-jan10.txt.xz privately to Guy since it may have
> some privacy; please do not spread;
> 
> tried a few meeting rooms only the last one failed roaming; may be
> because many ones have left office right now, don't have so much
> noise; will try again another busy time;

>From the log you provide, I can see both "direct probe timeout" and
"authentication timeout".

You mention it is in an noisy environment. The thing I am not sure is
this a device fail to transmit issue or fail to receive "ack" from AP
issue?
 
Is it possible for you to capture the sniffer trace if you have the
tools?


Thanks
Wey