Re: Quiet crackling noise at boot and after stopping music

[Hans de Goede <hansg@kernel.org>]

Hi Takashi,

On 6-Aug-25 4:42 PM, Takashi Iwai wrote:
> On Wed, 06 Aug 2025 15:57:51 +0200,
> Paul Menzel wrote:
>>
>> Dear Takashi,
>>
>>
>> Thank you for your reply.
>>
>> Am 06.08.25 um 10:46 schrieb Takashi Iwai:
>>> On Wed, 06 Aug 2025 10:34:57 +0200, Paul Menzel wrote:
>>
>>>> Am 06.08.25 um 10:20 schrieb Takashi Iwai:
>>>>> On Wed, 06 Aug 2025 10:15:08 +0200, Paul Menzel wrote:
>>>>
>>>>>> I believe the Realtek refactoring caused a regression on my Intel Kaby
>>>>>> Lake laptop Dell XPS 13 9360. There is quiet crackling noise during
>>>>>> boot, when GDM is started, and also after playing music is
>>>>>> stopped. It’s reproducible with 6.16.0-04055-g14bed9bc81ba, that
>>>>>> contains the sound subsystem pull request.
>>>>>>
>>>>>> 177bf8620cf4 Merge tag 'sound-6.17-rc1' of
>>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
>>>>>>
>>>>>> I uploaded the run of alsa-info [1]. I try to verify with plain 6.16 later.
>>>>>
>>>>> It's likely because of the missing CONFIG_SND_HDA_CODEC_* selections.
>>>>> Please set CONFIG_SND_HDA_CODEC_ALC269=m and
>>>>
>>>> Indeed, I didn’t select this.
>>>>
>>>>> CONFIG_SND_HDA_CODEC_HDMI_INTEL=m if not done yet.
>>>>
>>>> I had selected this.
>>>>
>>>>> Those were already set to default=y in the later PR for avoiding such
>>>>> a pitfall.
>>>>
>>>> I remember I tried to check which to select, and I ran `alsa-info` to
>>>> find the codecs, but only found:
>>>>
>>>>      Codec: Realtek ALC3246
>>>>
>>>> As this didn’t match to any of the offerings, I didn’t select
>>>> it. May I suggest to extend the Kconfig help texts with notes how to
>>>> determine the correct module?
>>>
>>> There are quite lots of different codec names, so we can't put all
>>> them, unfortunately...
>>
>> Understood. Then maybe just the command how to find the id, that
>> people can use to grep the correct module for? From the script
>> `alsa-info.sh`, maybe, I found:
>>
>>     $ grep -e Codec -e "Vendor Id" /proc/asound/card*/codec#*
>>     /proc/asound/card0/codec#0:Codec: Realtek ALC3246
>>     /proc/asound/card0/codec#0:Vendor Id: 0x10ec0256
>>     /proc/asound/card0/codec#2:Codec: Intel Kabylake HDMI
>>     /proc/asound/card0/codec#2:Vendor Id: 0x8086280b
>>
>> So mention `/proc/asound/card*/codec#*`?
> 
> Honestly speaking, I don't want that; it won't scale, and new codecs
> may appear at any moment.  Then we'd have to manage multiple places
> for adding or removing ids.
> 
> Maybe an alternative option would be to mark prompt of each Realtek
> codec driver with EXPERT, so that all Realtek drivers will be enabled
> (when CONFIG_SND_HDA_CODEC_REALTEK is set) unless you say you're an
> expert :)

FWIW that sounds like a good idea to me.

Regards,

Hans