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From:   Racinglee <cydiaimpactor2003@gmail.com>
Date:   Wed, 19 Jul 2023 19:03:06 -0700
Message-ID: <CAL4Djy3KeD51LtT0bT2aRe9S_uwMiAfa-X=V2SfdnYt-MYp5ng@mail.gmail.com>
Subject: Re: 6.4 and higher causes audio distortion
To:     Bagas Sanjaya <bagasdotme@gmail.com>
Cc:     Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Regressions <regressions@lists.linux.dev>,
        Linux ALSA Development <alsa-devel@alsa-project.org>
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On Sat, Jul 15, 2023 at 3:56=E2=80=AFAM Bagas Sanjaya <bagasdotme@gmail.com=
> wrote:
>
> Hi,
>
> I notice a regression report on Bugzilla [1]. Quoting from it:
>
> > I have a Lenovo ThinkPad X1 Yoga Gen 7 running Arch Linux. Linux 6.4 an=
d higher, cause audio distortion. Sometimes, this occurs to the point that =
nearly nothing is discernible. This carries over to wired headphones. The i=
ssue occurs on the entire mainline 6.4.x kernel series and also the 6.4.3 s=
table and 6.5 RC1 kernel, which are the latest at the time of writing. The =
issue occurs on both the Arch distributed kernels, and the mainline kernels=
.
> >
> > Linux kernels 6.3.x are not affected and neither is the 6.1 LTS kernel =
series which is what I am temporarily using. On Windows 10/11 too, the audi=
o works as it should. This indicates that my hardware is not at fault. Blue=
tooth audio is not impacted from my testing, either.
> >
> > The distortion doesn't start immediately. It either occurs automaticall=
y after a random amount of time, or when I increase/decrease the volume, or=
 when I skip forward/backward to a section. In order to stop the distortion=
, I have to either increase/decrease the volume until it stops, or skip for=
ward/backward until it stops, or restart Pipewire via systemd, however it s=
tarts again due to one of the aforementioned reasons.
> >
> > At the time of this report, I am running Pipewire 0.3.74 and Wireplumbe=
r 0.4.14. This also doesn't seem like a Pipewire/Wireplumber issue, since t=
hese same versions work fine on the 6.1 LTS kernels without causing any aud=
io distortion.
> >
> > I wrote about this on the Arch Linux forums, too, and seems like at lea=
st two other people are facing this issue. Here's the forum post: https://b=
bs.archlinux.org/viewtopic.php?id=3D287068
> >
> > Furthermore, I filed a bug report on the Arch Linux Bug Reporter, where=
 they suggested that the issue is a kernel regression and should be reporte=
d upstream, here. Here's the bug report that I filed on the Arch Linux Bug =
Reporter for anyone interested: https://bugs.archlinux.org/task/79081?proje=
ct=3D1&pagenum=3D10
> >
> > I have attached the dmesg outputs of the mainline 6.5 RC1 kernel.
> >
> > Here's some audio related hardware information from my device:
> >
> > inxi -A
> >
> > Audio:
> > Device-1: Intel Alder Lake PCH-P High Definition Audio
> > driver: sof-audio-pci-intel-tgl
> > API: ALSA v: k6.5.0-rc1-1-mainline status: kernel-api
> >
> >
> > pactl info
> >
> > Server String: /run/user/1000/pulse/native
> > Library Protocol Version: 35
> > Server Protocol Version: 35
> > Is Local: yes
> > Client Index: 138
> > Tile Size: 65472
> > User Name: tux
> > Host Name: NSA-Terminal-4
> > Server Name: PulseAudio (on PipeWire 0.3.74)
> > Server Version: 15.0.0
> > Default Sample Specification: float32le 2ch 48000Hz
> > Default Channel Map: front-left,front-right
> > Default Sink: alsa_output.pci-0000_00_1f.3-platform-skl_hda_dsp_generic=
.HiFi__hw_sofhdadsp__sink
> > Default Source: alsa_input.pci-0000_00_1f.3-platform-skl_hda_dsp_generi=
c.HiFi__hw_sofhdadsp_6__source
> > Cookie: f9dc:5e7a
> >
> >
> > I can't figure out why this is happening. Kindly ask for any more infor=
mation that is necessary. Thank you.
>
> See Bugzilla for the full thread and attached dmesg.
>
> Anyway, I'm adding it to regzbot so that it doesn't fall through
> cracks unnoticed:
>
> #regzbot introduced: v6.3..v6.4 https://bugzilla.kernel.org/show_bug.cgi?=
id=3D217673
> #regzbot title: PipeWire + Wireplumber audio distortion on Lenovo ThinkPa=
d X1 Yoga Gen 7
> #regzbot link: https://bbs.archlinux.org/viewtopic.php?id=3D287068
> #regzbot link: https://bugs.archlinux.org/task/79081?project=3D1&pagenum=
=3D10
>
> Thanks.
>
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=3D217673
>
> --
> An old man doll... just what I always wanted! - Clara

Updating regzbot after newer findings and determinations about the
possible culprit commit

#regzbot title: 6.4 and higher causes audio distortion

#regzbot introduced: v6.4-rc1..1bf83fa6654c
https://bugzilla.kernel.org/show_bug.cgi?id=3D217673#c5