Sound issues with the 5.10.x kernel (alsa)

Stefan Wahren stefan.wahren at
Mon Feb 8 07:22:56 EST 2021

Hi Diederik,

Am 08.02.21 um 12:47 schrieb Diederik de Haas:
> Hi,
> This is basically me forwarding the bug I reported on Debian's BTS:
> TL;DR: I have a RPi 3B+ running pure Debian Bullseye arm64 (~from 
>, named rpi-mpd, connected via HDMI cable to my AV Receiver.
can you please confirm that the bcm2835-audio driver causing the issues?
> Playing music worked fine with kernel 5.9, but with 5.10.2-1 the music 
> (quality) became not good to quite horribly, because of (static) noise and 
> distortion.
> With kernel version 5.10.9 (linux-image-5.10.0-2-arm64) it all seemed fixed, 
> but returned with 5.10.12 (linux-image-5.10.0-3-arm64) and is also present 
> with 5.10.13.

I cannot explain why 5.10.9 works for you, but we had multiple
regressions in 5.10. Currently i cannot see any of the fixes by Phil
Elwell in linux-stable. Maybe they won't apply and needs to be backport

Just for reference here are the revelant patches:

Could you please try?

Best regards

> I can consistently reproduce this issue, rebooting into 5.10.9 and playing 
> music is fine again, so I *think* this is not a local issue.
> This ML is the closest I can think of as 'upstream', so hopefully more insight  
> can be accomplished here ... and a fix.
> Cheers,
>   Diederik
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