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

[Stefan Wahren]

Hi,

Am 28.03.21 um 07:58 schrieb Ryutaroh Matsumoto:
>> 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".
i assume you set this option in the config.txt? This shouldn't have any
affect for the mainline kernel / DT.
>
> Best regards, Ryutaroh