From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B356C47089 for ; Fri, 2 Dec 2022 16:04:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232114AbiLBQEg (ORCPT ); Fri, 2 Dec 2022 11:04:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35478 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233734AbiLBQEQ (ORCPT ); Fri, 2 Dec 2022 11:04:16 -0500 Received: from wp530.webpack.hosteurope.de (wp530.webpack.hosteurope.de [80.237.130.52]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8DE689AC3; Fri, 2 Dec 2022 08:02:50 -0800 (PST) Received: from [2a02:8108:963f:de38:eca4:7d19:f9a2:22c5]; authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1p18Ux-0005Di-Pr; Fri, 02 Dec 2022 17:02:47 +0100 Message-ID: <9a03c244-adff-afaf-7385-d8e89cd3f338@leemhuis.info> Date: Fri, 2 Dec 2022 17:02:47 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [regression] Bug 216753 - 6e 6 ghz bands are disabled since 5.16 on intel ax211 Content-Language: en-US, de-DE To: Dave Chiluk , "Coelho, Luciano" Cc: "Greenman, Gregory" , "linux-wireless@vger.kernel.org" , "johannes@sipsolutions.net" , "regressions@lists.linux.dev" , "linux-kernel@vger.kernel.org" References: <14722778-dda0-cb9f-8647-892493d94a5c@leemhuis.info> <2026016246ef719605c9932feeb56b105833593b.camel@intel.com> From: Thorsten Leemhuis In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1669996970;1d693492; X-HE-SMSGID: 1p18Ux-0005Di-Pr Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02.12.22 16:37, Dave Chiluk wrote: > The other possibility is that this is actually a bios bug, as the DSM > is being read out of ACPI. In which case that would be Dell's fault. Yes and no, but no: A kernel change exposed this problem, hence it doesn't matter if the BIOS is faulty: it's makes it a kernel regression and those are not allowed. For more on this see https://docs.kernel.org/admin-guide/reporting-issues.html That at least would be the normal approach. But the thing is: the legal implications when it comes to things like wifi make this somewhat trickier. :-/ > On Thu, Dec 1, 2022 at 5:33 AM Coelho, Luciano wrote: >> >> On Thu, 2022-12-01 at 11:14 +0100, Thorsten Leemhuis wrote: >>> Hi, this is your Linux kernel regression tracker. >>> >>> Luca, I noticed a regression report in bugzilla where I'd like your >>> advice on. To quote https://bugzilla.kernel.org/show_bug.cgi?id=216753 >> >> Hi Thorsten wearing-the-regression-hat, 🙂 :-D >> I'm not the maintainer of iwlwifi anymore, so I'm adding the new >> maintainer here, Gregory Greenman. Well, you where the author of the commit, that's why I addressed you. But if Gregory or someone else steps in that's of course totally fine for me as well. :-D Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) P.S.: As the Linux kernel's regression tracker I deal with a lot of reports and sometimes miss something important when writing mails like this. If that's the case here, don't hesitate to tell me in a public reply, it's in everyone's interest to set the public record straight. >> Gregory, can you take a look? >> >> >>>> It looks like the self-managed regulatory information is causing the 6ghz band to be disabled on my AX211 (in the US). >>>> iw reg get shows no 6ghz bands (output at the bottom). >>>> >>>> $ sudo iw phy0 channel >>>> ... >>>> Band 4: >>>> * 5955 MHz [1] (disabled) >>>> * 5975 MHz [5] (disabled) >>>> * 5995 MHz [9] (disabled) >>>> ....(continues with all disabled >>>> * 7115 MHz [233] (disabled) >>>> ... >>>> >>>> I was able to narrow this down to having been introduced during the 5.16 development window, as 5.15.79 linux-stable kernel works and the 5.16.12 does >>>> not (earlier builds of 5.16 kernel fail to boot on my machine for some reason). >>>> >>>> I found https://community.frame.work/t/kernel-5-16-6ghz-disabled-ax210/15675/5 >>>> and they imply that this regression was introduced by >>>> 698b166ed3464e1604a0e6a3e23cc1b529a5adc1 >>>> I haven't independently verified this commit as the definitive issue. >>> >>> You authored 698b166ed346 ("iwlwifi: mvm: read 6E enablement flags from >>> DSM and pass to FW"). As it is a regressions is ideally should be dealt >>> with. But this area in tricky due to the legal implications. Hence I >>> wonder: is there anything we can do about this, or is this simply a case >>> where we have to bite the bullet and live with this regression? >>> >>> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) >>> >>> P.S.: As the Linux kernel's regression tracker I deal with a lot of >>> reports and sometimes miss something important when writing mails like >>> this. If that's the case here, don't hesitate to tell me in a public >>> reply, it's in everyone's interest to set the public record straight. > >