Message-ID: <4E46E3C5.5060403@fastmail.fm> (sfid-20110813_225128_610785_779568F3)
Date: Sat, 13 Aug 2011 22:51:17 +0200
From: Bernd Schubert <bernd.schubert@fastmail.fm>
MIME-Version: 1.0
To: Christian Lamparter <chunkeey@googlemail.com>,
	linux-wireless@vger.kernel.org
Subject: Re: carl9170 does not like all frequencies
References: <j26l8a$ea9$1@dough.gmane.org> <201108132234.16886.chunkeey@googlemail.com>
In-Reply-To: <201108132234.16886.chunkeey@googlemail.com>
Content-Type: text/plain; charset=UTF-8
Sender: linux-wireless-owner@vger.kernel.org

On 08/13/2011 10:34 PM, Christian Lamparter wrote:
> On Saturday 13 August 2011 22:02:18 Bernd Schubert wrote:
>> I bought a new usb wifi device with 2 antennas to get a better
>> connection to my router.
> So, you are saying that there was something wrong with the old
> stick as well, right!?

There is nothing wrong with the previous zd1211rw device, its antenna is
just a bit weak and so I only can use it, when my system is rather close
to the router...

> 
>> From point of few of connection strength that worked out very well, from
>> point of view of connection stability that is total disaster so far.
> Sure, you are affected by constant "loud" noise on the frequency/band.
> The hardware is unable to finish the noise floor calibration and therefore
> gives up.
> 
>> With Ubuntus 2.6.38-something it connects and then entirely fails after
>> sending a few bytes. So I checked git log and noticed carl9170 is being
>> used in recent kernels and connection issues have been fixed in 3.1-git.
> what commits are you talking about?


For example:

582965672831180b2e1f5e15ea1f7dc6f5b93018
"carl9170: set beacon xmit power to the max"

> 
>>> [ 1058.936551] cfg80211: Calling CRDA to update world regulatory domain
>>> [ 1058.945510] cfg80211: World regulatory domain updated:
>>> [ 1058.945519] cfg80211:     (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
>>> [ 1058.945529] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
>>> [ 1058.945538] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
>>> [ 1058.945547] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
>>> [ 1058.945555] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
>>> [ 1058.945563] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
>>> [ 1058.945604] cfg80211: Calling CRDA for country: 97
>>> [ 1061.373997] ieee80211 phy1: channel change: 2417 -> 2422 failed (2).
>>> [ 1061.682115] ieee80211 phy1: channel change: -1 -> 2422 failed (2).
>>> [ 1061.682132] usb 10-1.2: restart device (7)
>>> [ 1062.096523] cfg80211: Calling CRDA to update world regulatory domain
>>> [ 1062.105469] cfg80211: World regulatory domain updated:
>>
>>
>> Any idea what is going on here? Do I need a crda tool? Or is something
>> else failing?
> Yes, you need crda, if you haven't installed it already.

Sorry, I forgot "update" there. So I asked if I would need to update
crda. I just did that, but I just don't want to disconnect right now to
see if it connects any faster. Those messages still appear every 16
seconds and spam my logs :(

> 
>> Update: While writing this up and after I plugged in my zd1211rw device,
>> eventually also my tp-link carl9170 device connected a few minutes
>> later. Do I always have to wait for 20 minutes to get a connection now?
> That's odd. TP-Link does not sell any AR9170 anymore, in fact they dropped it
> more than a year ago and replaced the line-up with AR7010+AR9287? so where
> did you get this obsolete device?

The device is a TL-WN822N available widely here, I think. I got mine
from amazon, but I also could have bought it in a local shop in the city.


Thanks,
Bernd