linux-kernel - Re: [PATCH] ALSA: hda/realtek: Reduce the Headphone static noise on XPS 9350/9360

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Message-ID: <s5h1rvpjp0o.wl-tiwai@suse.de>
Date:   Mon, 07 Oct 2019 03:57:43 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Takashi Iwai <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <kailang@...ltek.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ALSA: hda/realtek: Reduce the Headphone static noise on XPS 9350/9360

On Thu, 03 Oct 2019 06:39:19 +0200,
Kai-Heng Feng wrote:
> 
> Headphone on XPS 9350/9360 produces a background white noise. The The
> noise level somehow correlates with "Headphone Mic Boost", when it sets
> to 1 the noise disappears. However, doing this has a side effect, which
> also decreases the overall headphone volume so I didn't send the patch
> upstream.
> 
> The noise was bearable back then, but after commit 717f43d81afc ("ALSA:
> hda/realtek - Update headset mode for ALC256") the noise exacerbates to
> a point it starts hurting ears.
> 
> So let's use the workaround to set "Headphone Mic Boost" to 1 and lock
> it so it's not touchable by userspace.
> 
> Fixes: 717f43d81afc ("ALSA: hda/realtek - Update headset mode for ALC256")
> BugLink: https://bugs.launchpad.net/bugs/1654448
> BugLink: https://bugs.launchpad.net/bugs/1845810
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Applied now.  Thanks.


Takashi