[regression] Headphone output gets unproperly powered down - Mi Notebook Pro 2020 (ALC256) (fwd of b.k.o bug #215484; starting with 5.14.14)

[Kai-Heng Feng]

Hi Thorten,

On Mon, Mar 21, 2022 at 2:48 PM Thorsten Leemhuis
<regressions at leemhuis.info> wrote:
>
> Hi, this is your Linux kernel regression tracker. Top-posting for once,
> to make this easily accessible to everyone.
>
> Could anybody please finally look into this bisected regression from
> 5.14.13 to 5.14.14 (f8d3c17e1c37 ("ALSA: hda/realtek - ALC236 headset
> MIC recording issue")) that according to a recent bugzilla comment from
> reporter is still present in recent 5.16 kernels?

I just asked the affected user to test my patch. Once it's tested I'll
send it out.

Kai-Heng

>
> Ciao, Thorsten
>
> On 12.01.22 08:15, Thorsten Leemhuis wrote:
> >
> > Hi, this is your Linux kernel regression tracker speaking.
> >
> > I'm forwarding a regression reported in bugzilla.kernel.org to the list,
> > to make sure all parties interested in this are aware of it. The
> > reporter is CCed. Not CCing the stable list in this case, as 5.14 is EOL
> > already.
> >
> > https://bugzilla.kernel.org/show_bug.cgi?id=215484
> >
> >> With headphones (or an auxiliary jack) plugged in, the audio output
> >> is fine when anything is playing, but when that's stopped a loud pop
> >> can be heard after some seconds and if the jack is connected to an
> >> external amplifier it gets really noisy. Everything gets back to
> >> normal whenever audio playback is resumed, although with another loud
> >> pop at the start.
> >>
> >> This has been happening since kernel 5.14.14, whereas 5.14.13 is
> >> fine. I suspect it has to do with the ALC256 mute logic implemented
> >> in that version
> >> (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/diff/sound/pci/hda/patch_realtek.c?id=v5.14.14&id2=v5.14.13)
> >>
> >> OS: Fedora Linux 35 Kernel: 5.16.0-60 Vanilla Hardware: Xiaomi Mi
> >> Notebook Pro Enhanced 2020 (i7 10510U, ALC256)
> >
> > Ciao, Thorsten
> >
> > #regzbot introduced v5.14.13..v5.14.14
> > #regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=215484
> > #regzbot from: Emanuele Melzi <itsbytebites at tutanota.com>