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Thu, 9 Dec 2021 03:34:30 +0100 (CET) Received: from int-mx003.mykolab.com (unknown [10.9.13.3]) by mx.kolabnow.com (Postfix) with ESMTPS id AE097408FD; Thu, 9 Dec 2021 03:34:30 +0100 (CET) Received: from ext-subm002.mykolab.com (unknown [10.9.6.2]) by int-mx003.mykolab.com (Postfix) with ESMTPS id 053803E07; Thu, 9 Dec 2021 03:34:29 +0100 (CET) From: Thiago Jung Bauermann To: Paxton Evans Cc: help-guix@gnu.org Subject: Re: No sound on laptop after linux-libre 5.15 Date: Wed, 08 Dec 2021 23:34:24 -0300 Message-ID: <2249898.6YmaLFrJ0H@popigai> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" Received-SPF: pass client-ip=212.103.80.153; envelope-from=bauermann@kolabnow.com; helo=mx.kolabnow.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-guix@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-guix-bounces+larch=yhetil.org@gnu.org Sender: "Help-Guix" X-Migadu-Flow: FLOW_IN ARC-Message-Signature: i=1; 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aspmx1.migadu.com; dkim=pass header.d=kolabnow.com header.s=dkim20160331 header.b=S5h1ZpFb; dmarc=pass (policy=quarantine) header.from=kolabnow.com; spf=pass (aspmx1.migadu.com: domain of "help-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="help-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -3.65 Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=kolabnow.com header.s=dkim20160331 header.b=S5h1ZpFb; dmarc=pass (policy=quarantine) header.from=kolabnow.com; spf=pass (aspmx1.migadu.com: domain of "help-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="help-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 165F3C528 X-Spam-Score: -3.65 X-Migadu-Scanner: scn1.migadu.com X-TUID: TnFQbioegnTU Hello Paxton, Em quarta-feira, 8 de dezembro de 2021, =C3=A0s 01:55:13 -03, Paxton Evans= =20 escreveu: > Rolling back to linux-libre 5.14.21 (guix > ea7233befb9570cce47e5ca71725b285a580cd22) totally fixes this issue. >=20 > Troubleshooting sound issues on GNU/Linux is such a nightmare that I'm > hoping this list can help me, as I don't really know much about how > sound on our favorite OS really works, and don't have enough information > to file a bug. Can anyone give me pointers on where to start looking? > dmesg on 5.15.6 didn't seem to report anything strange. I=E2=80=99m not particularly familiar with the moving parts that make sound= work=20 either, so I=E2=80=99ll focus on the kernel side of things. My first idea w= ould be=20 trying to boot with the =E2=80=9Cdebug=E2=80=9D kernel command line option,= which increases=20 the verbosity of kernel messages. Perhaps something helpful will show up in= =20 dmesg that way? If not, and if the only change in the working setup vs the non-working=20 setup is the kernel version, then it=E2=80=99s a regression in the kernel. = If you=20 are willing to run the upstream Linux kernel on your machine (i.e., the=20 non-libre kernel), the first step would be to run Linux v5.15.6 and see if= =20 sound works. If it does, then it=E2=80=99s a bug in linux-libre itself and you should re= port the=20 problem to them. If it doesn=E2=80=99t, it=E2=80=99s a bug in Linux itself = and the most=20 straightforward (but tedious and time-intensive) way to find the kernel=20 commit that caused the bug is to use =E2=80=9Cgit bisect=E2=80=9D: https://wiki.gentoo.org/wiki/Kernel_git-bisect That is, assuming that you are comfortable building kernels. You need to use v5.14 as your known-good version not v5.14.21 because your= =20 range should be a =E2=80=9Cstraight line=E2=80=9D in the version history, a= nd v5.14.x=20 versions branch off from mainline and thus aren=E2=80=99t ancestors of v5.1= 5.x. Also, since you=E2=80=99d be running random kernel commits, it=E2=80=99s im= portant to be=20 aware that there=E2=80=99s a small but non-zero risk of running a bad kerne= l=20 version which could corrupt something on your system. E.g., not long ago=20 during the v5.12 development cycle there was a filesystem corruption bug:=20 https://www.phoronix.com/scan.php?page=3Dnews_item&px=3DLinux-5.12-Corrupti= on-Fixed You wouldn=E2=80=99t be at risk of hitting that particular bug since your r= ange=20 starts at v5.14, but it=E2=80=99s not inconceivable that there could be som= ething=20 bad in your range (though I=E2=80=99m not aware of anything). The safest wa= y to=20 address that is to run the bisect kernels in a temporary Linux installation= =20 on your machine, such as in a USB flash drive rather than on your main Linu= x=20 installation. =2D-=20 Thanks, Thiago