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Re: No sound on laptop after linux-libre 5.15

From: Paxton Evans
Subject: Re: No sound on laptop after linux-libre 5.15
Date: Fri, 04 Feb 2022 14:04:06 -0800

On 2021-12-08 23:05, Leo Famulari wrote:
> On Wed, Dec 08, 2021 at 11:34:24PM -0300, Thiago Jung Bauermann wrote:
>> Em quarta-feira, 8 de dezembro de 2021, às 01:55:13 -03, Paxton Evans
>> escreveu:
>> > Rolling back to linux-libre 5.14.21 (guix
>> > ea7233befb9570cce47e5ca71725b285a580cd22) totally fixes this issue.
>> >
>> > 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.
> Thanks for your report. Everything Thiago said is important, and it
> would also help if you told us what you had tried to do. That is, what
> are you using to make sound?
> My basic sound test is to use mpg123 to play an MP3 file. You can use
> the --output option to choose which output to play through, to be sure.
> And you can use --list-modules to see what's available.
> On Guix System, we aim to make applications use Pulseaudio by default,
> so you can use `mpg123 --output pulse file.mp3` to test that. You can
> also use `mpg123 --output alsa file.mp3` if you'd rather test ALSA.
> Unfortunately I currently cannot test sound on Guix System with
> linux-libre. However, it does work for me on a computer using Guix
> System with a custom kernel.

In case anyone finds this later, I wanted to update and say that this
was indeed a kernel bug, and fixed in Linux commit
7f6e3cbbd60044102373f5a7f86d5f4e89a99747 (included in 5.15.17 in both
vanilla and linux-libre).


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