Re: Quiet crackling noise at boot and after stopping music

[Takashi Iwai <tiwai@suse.de>]

On Wed, 06 Aug 2025 19:00:59 +0200,
Hans de Goede wrote:
> 
> 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.

OK, will submit a formal patch set.


thanks,

Takashi