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Date:   Thu, 21 Sep 2023 22:09:58 +0200
From:   Marc Haber <mh+debian-user-german@zugschlus.de>
To:     Uwe =?utf-8?Q?Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
Cc:     "Greenman, Gregory" <gregory.greenman@intel.com>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        "exp-311223@news.muster.net" <exp-311223@news.muster.net>,
        "tychokirchner@gmail.com" <tychokirchner@gmail.com>,
        "rene@debian.org" <rene@debian.org>,
        "Juergen.bausa@online.de" <Juergen.bausa@online.de>,
        "sebastian.suchanek@gmx.de" <sebastian.suchanek@gmx.de>
Subject: Re: iwlwifi in German ICE4 trains
Message-ID: <ZQyjFmOTUsUoOXRD@torres.zugschlus.de>
References: <20230423085510.xpmcuzfhzqa4dyhs@pengutronix.de>
 <c0153e5dd0459d351807002df7cef9eb30b04e86.camel@intel.com>
 <20230424042135.4xwtbobs2p5wmnjk@pengutronix.de>
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User-Agent: Mutt/2.2.9 (2022-11-12)
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Hi,

I still have the problem in all ICE 4 trains with my notebook.

On Mon, Apr 24, 2023 at 06:21:35AM +0200, Uwe Kleine-König wrote:
> first of all: thanks for your prompt response.
> 
> On Sun, Apr 23, 2023 at 01:06:45PM +0000, Greenman, Gregory wrote:
> > Based on the log, I can understand that it had successfully connected to the AP
> > (supplicant management interface state: associating -> completed);
> > then there're some DHCP errors and eventually the AP sends a deauth.
> > It's hard to say what can cause it, but if you'll be able to reproduce
> > the issue, it'd be great if you could collect a trace-cmd dump with
> > this command:
> > sudo trace-cmd record -e iwlwifi -e mac80211 -e cfg80211 -e iwlwifi_msg
> 
> Done, see https://www.kleine-koenig.org/tmp/20230424-trace.dat for the
> resulting trace.dat file.

Would a trace.dat from my notebook help?

> > It'll be also helpfull if you'll be able to say which specific
> > modprobe option fixes the issue.
> 
> The relevant one is
> 	options iwlwifi 11n_disable=1

This is unfortunately an option that you don't want in effect all the
time as it reduces Wifi performance at home to 11g/11a typical 54
Mbit/s.

Greetings
Marc


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