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Groups > linux.debian.kernel > #69998

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

Cross-posted to 2 groups.

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> 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.

Giving "enable_hdmi=0" to snd_bcm2835.ko does not improve the situation,
while module_blacklisting snd_bcm2835 suppresses all the symptoms reported.
snd_bcm2835.ko in 5.10.24 seems having a bug ignoring "enable_hdmi=0".

Best regards, Ryutaroh

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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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