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Groups > linux.debian.bugs.dist > #1053964

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 08:10 +0200
Message-ID <BXwMy-DW-3@gated-at.bofh.it> (permalink)
References <BXrWx-5Ks-3@gated-at.bofh.it> <BXrWx-5Ks-5@gated-at.bofh.it> <BXrWx-5Ks-1@gated-at.bofh.it> <BpCrn-2Lq-1@gated-at.bofh.it> <BXrWx-5Ks-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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Thread

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

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