linux-kernel - Re: Regression: very quiet speakers on Thinkpad T570s

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Date:   Fri, 30 Nov 2018 11:51:33 -0500
From:   Jeremy Cline <jcline@...hat.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Kailang Yang <kailang@...ltek.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Tim Van den Eynde <redhat@...ynde.com>,
        alsa-devel@...a-project.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Regression: very quiet speakers on Thinkpad T570s

On 11/30/18 11:00 AM, Takashi Iwai wrote:
> On Fri, 30 Nov 2018 15:49:17 +0100,
> Jeremy Cline wrote:
>>
>> Hi,
>>
>> Some folks have reported on the Fedora bug tracker[0] that the laptop
>> speaker volume is very low on the Thinkpad T570 when running a kernel
>> that includes commit 61fcf8ece9b6 ("ALSA: hda/realtek - Enable Thinkpad
>> Dock device for ALC298 platform").
>>
>> alsa-info.sh from v4.15.4 (just before commit 61fcf8ece9b6 arrived in
>> stable) and v4.19.4 with the issue present are attached to the bugzilla.
>> I've also Cc'd Tim, who uploaded them and has the laptop in question.
>>
>> [0] https://bugzilla.redhat.com/show_bug.cgi?id=1554304
> 
> Could you pinpoint which kernel version started showing the
> regression, at least?  The diffs are fairly wide between 4.15 and
> 4.19.

Ah, sorry for not being more clear. The regression appears to be
introduced by commit 61fcf8ece9b6, which got backported to v4.15.5
because it addressed a bug with the dock[0]. v4.19.4 with that commit
reverted works, according to the bug reporter.

[0] https://bugzilla.kernel.org/show_bug.cgi?id=195161

Regards,
Jeremy