Bug#978025: Sound issues with the 5.10.x kernel (alsa)

From	Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#978025: Sound issues with the 5.10.x kernel (alsa)
Date	2021-03-28 03:00 +0200
Message-ID	<BXrWx-5Ks-1@gated-at.bofh.it> (permalink)
References	<BXrWx-5Ks-3@gated-at.bofh.it> <BXrWx-5Ks-5@gated-at.bofh.it> <BpCrn-2Lq-1@gated-at.bofh.it> <BXrWx-5Ks-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Hi all,

From: Stefan Wahren <stefan.wahren@i2se.com>
Subject: Re: Sound issues with the 5.10.x kernel (alsa)
Date: Mon, 8 Feb 2021 13:22:56 +0100
>> This is basically me forwarding the bug I reported on Debian's BTS:
>> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978025
>> TL;DR: I have a RPi 3B+ running pure Debian Bullseye arm64 (~from 
>> raspi.debian.net), named rpi-mpd, connected via HDMI cable to my AV Receiver.
> can you please confirm that the bcm2835-audio driver causing the issues?

I think the root cause of this issue is that both vc4.ko and snd_bcm2835.ko
try to provide ALSA sinks to HDMI audio outputs from RPi.
Why do the two drivers provide the same functionality for the same device?
It seems nonsense.
There must be some coordination between vc4.ko and snd_bcm2835.ko
on who provides ALSA sinks of RPi HDMI output.

The non-coordination that both drivers provide different ALSA sinks of the same
device already causes another symptom as
http://lists.infradead.org/pipermail/linux-rpi-kernel/2021-March/008077.html

Best regards, Ryutaroh Matsumoto

Thread

Bug#978025: linux-image-5.10.0-trunk-arm64: alsa audio output problems since 5.10 kernel Diederik de Haas <didi.debian@cknow.org> - 2020-12-24 18:20 +0100
  Bug#978025: marked as done (linux-image-5.10.0-trunk-arm64: alsa  audio output problems since 5.10 kernel) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-01-23 20:30 +0100
  Processed: Re: Seems un-fixed again "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-02-05 12:50 +0100
  Bug#978025: Seems un-fixed again Diederik de Haas <didi.debian@cknow.org> - 2021-02-05 12:50 +0100
    Bug#978025: Fixing title Diederik de Haas <didi.debian@cknow.org> - 2021-02-05 13:30 +0100
    Bug#978025: Problem also present in 5.10.13-1 Diederik de Haas <didi.debian@cknow.org> - 2021-02-08 12:30 +0100
    Bug#978025: Forwarded to linux-rpi-kernel ML Diederik de Haas <didi.debian@cknow.org> - 2021-02-08 13:00 +0100
  Processed: Re: Bug#978025: Fixing title "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-02-05 13:30 +0100
  Processed: Problem also present in 5.10.13-1 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-02-08 12:30 +0100
  Processed: Forwarded to linux-rpi-kernel ML "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-02-08 13:00 +0100
  Bug#978025: Sound issues with the 5.10.x kernel (alsa) Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp> - 2021-03-28 03:00 +0200
    Bug#978025: Sound issues with the 5.10.x kernel (alsa) Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp> - 2021-03-28 08:10 +0200
      Bug#985928: Sound issues with the 5.10.x kernel (alsa) Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp> - 2021-03-29 01:20 +0200
        Bug#978025: Sound issues with the 5.10.x kernel (alsa) Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp> - 2021-03-29 01:30 +0200
  Bug#978025: marked as done (linux-image-5.10.x: alsa audio output  problems on RPi since 5.10 kernel) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-05-13 15:40 +0200

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