From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wm0-f66.google.com ([74.125.82.66]:33227 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751340AbcIUHBj (ORCPT ); Wed, 21 Sep 2016 03:01:39 -0400 Received: by mail-wm0-f66.google.com with SMTP id w84so6908063wmg.0 for ; Wed, 21 Sep 2016 00:01:39 -0700 (PDT) Subject: Re: Problem with 40Mhz on 2.5GHz with Intel 8260 To: Emmanuel Grumbach References: <24d0d9c5-7695-9364-c5fa-97e9d52712dc@gmail.com> <79ad55e3-d7f7-0605-3499-a6b289dfb4f6@gmail.com> Cc: linux-wireless From: Volker Mische Message-ID: (sfid-20160921_090143_426207_E49CDF83) Date: Wed, 21 Sep 2016 09:01:36 +0200 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi, On 09/21/2016 08:54 AM, Emmanuel Grumbach wrote: >> On 09/20/2016 08:22 AM, Volker Mische wrote: >>> On 09/20/2016 07:39 AM, Emmanuel Grumbach wrote: >>>> On Mon, Sep 19, 2016 at 5:00 PM, Volker Mische wrote: >>>>> I'm having connectivity issues with an Intel 8260 on a 2.5GHz network >>>>> when using 40Mhz. I'm getting errors like >>>>> >>>>> Queue 2 stuck for 10000 ms. >>>>> >>>>> I've upgrade my system to the firmware version 21 (21.373438.0) and >>>>> Kernel 4.8.0-rc6 in hope that it fixes the issue and to be able to debug >>>>> the problem. >>>>> >>>>> I then found the page about platform noise [1]. I don't have any issue >>>>> for several hours now (normally I was hitting the issue every few >>>>> minutes) as I've set the cfg80211_disable_40mhz_24ghz parameter. >> >>>> We tried a few times to debug those, but they take a very long time to debug >>>> since typically we need lots of reproductions and the firmware team >>>> doesn't always >>>> the time to look at the data immediately so in the end, the people who >>>> reported this >>>> originally went away. >>>> Note that 40MHz on 2.4GHz is not an optimal configuration in crowded >>>> environment, >>>> but if you live in a place where you are pretty much the only one using those >>>> frequencies, then, it can be beneficial. >>> >>> It's at home. I normally see only one other wifi (I need to check which >>> frequency that one is using). >>> >>> >>>> What you can try is to disable low power states (by using power_scheme >>>> in iwlmvm) and see if it helps. >>> >>> I will try that. >> >> I've set the iwlmvm power_scheme to 1 (and allowed the 40Mhz >> connection). First I thought it's good, but after a while the queue >> still got stuck. Especially after waking up from a suspend (not sure if >> that matters). > > Ok - good to know. > >> >> What are the next steps? > > can you try to unplug the power cord? I had reports that said that > this can help. Again, just a debug step to give us a hint of what you > can be experiencing. Unplug without any module parameters or combined with the cfg80211_disable_40mhz_24ghz or power_scheme one? > Besides this, we need to go for firmware debugging. But as I said, > don't expect this to be fast and easy. Please open a bug in > bugzilla.kernel.org. CC linuxwifi@intel.com and we will guide you > there on how to provide the information we need. OK, will do once I did try with unplugging. I've seen previous reports on the issue. As I'm already running a Kernel compiled from source I hope that at least I can move fast :) Cheers, Volker