linux-kernel - Re: [PATCH v4] ASoC: amd: yc: Fix non-functional mic on Lenovo 82YM

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Date:   Mon, 2 Oct 2023 13:54:59 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     Sven Frotscher <sven.frotscher@...il.com>,
        mario.limonciello@....com, git@...ustwikerfors.se,
        alsa-devel@...a-project.org, lgirdwood@...il.com,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Takashi Iwai <tiwai@...e.com>
Subject: Re: [PATCH v4] ASoC: amd: yc: Fix non-functional mic on Lenovo 82YM

On Mon, Oct 02, 2023 at 02:28:47PM +0200, Linux regression tracking (Thorsten Leemhuis) wrote:
> On 02.10.23 13:52, Mark Brown wrote:

> > x86 firmware descriptions are terrible, it's just an endless procession
> > of quirks.  The model for ACPI is not to describe key information in the
> > kernel and instead on Windows load device specific information from
> > separately supplied tables.  On Linux that translates into these endless
> > quirks, on Windows it's platform specific drivers for otherwise generic
> > audio hardware.

> I know all of that, but from the many recent regression reports and
> patches it seems quirks were not needed for a bunch of Lenovo machines
> before c008323fe361bd ("ASoC: amd: yc: Fix a non-functional mic on
> Lenovo 82SJ") [v6.5]. That made me wonder if that commit really did the
> right thing or if there is a underlying bug somewhere that the newly
> added quirks hide, as I had a few such situations during the past few
> months. If you or others the experts in this area say that this is not
> the case here then I'm totally fine with that, it was just a question.

Until someone tests or otherwise provides specific information on a
given machine we're just guessing about how it's wired up.  

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