Return-path: Received: from mail-it0-f47.google.com ([209.85.214.47]:35500 "EHLO mail-it0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753091AbcIUGys (ORCPT ); Wed, 21 Sep 2016 02:54:48 -0400 Received: by mail-it0-f47.google.com with SMTP id r192so119499022ita.0 for ; Tue, 20 Sep 2016 23:54:48 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <79ad55e3-d7f7-0605-3499-a6b289dfb4f6@gmail.com> References: <24d0d9c5-7695-9364-c5fa-97e9d52712dc@gmail.com> <79ad55e3-d7f7-0605-3499-a6b289dfb4f6@gmail.com> From: Emmanuel Grumbach Date: Wed, 21 Sep 2016 09:54:42 +0300 Message-ID: (sfid-20160921_085458_736476_6676B1FB) Subject: Re: Problem with 40Mhz on 2.5GHz with Intel 8260 To: Volker Mische Cc: linux-wireless Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: > Hi, > > 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. 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.