linux-kernel - Re: [PATCH 4.19 096/139] ALSA: hda/realtek - fix the pop noise on headphone for lenovo laptops

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Message-ID: <20181213022107.GA4450@x1>
Date:   Thu, 13 Dec 2018 03:21:07 +0100
From:   Thomas Zeitlhofer <thomas.zeitlhofer@...it.at>
To:     Hui Wang <hui.wang@...onical.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Kailang Yang <kailang@...ltek.com>,
        Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 4.19 096/139] ALSA: hda/realtek - fix the pop noise on
 headphone for lenovo laptops

Hello Hui,

On Thu, Dec 13, 2018 at 08:23:40AM +0800, Hui Wang wrote:
> Hello Thomas,
> 
> I have sent a new patch to fix this LED regression, after applying
> this patch (ALSA: hda/realtek - fix the pop noise on headphone for
> lenovo laptops) and the new patch (ALSA: hda/realtek - Fix the mute
> LED regresion on Lenovo X1  Carbon),  the issue will be fixed.
> 
> This is the new patch I sent (also CCed to stable):
> 
> http://mailman.alsa-project.org/pipermail/alsa-devel/2018-December/142747.html

thanks, I can confirm that this fixes the LED regression.

> About the noise, if you follow the steps as below, you would hear the
> noticeable click/pop noise:
> 
> 1. Hookup a set of headphones that you can separately place in/on your
> ears.  (ie. ear buds)
> 
> 2. Put only the right headphone in/on your ear.
> 
> 3. Go to the Gnome sound settings and bring up the "Test Speakers"
> function
> 
> 4. Play the left speaker test
> 
> You would expect to hear nothing in the right ear, but instead you
> hear a "pop" at the start of each word spoken. ("pop" Front "pop"
> left). You can repeat with the left headphone and see similar results.
> I even tried shifting the balance all the way to the left/right and
> get the same results.

Thank you for elaborating on the noise problem - now I could also
reproduce it and see that your patch (ALSA: hda/realtek - fix the pop
noise on headphone for lenovo laptops) fixes it.

Regards,

Thomas