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    SubjectRe: [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@canonical.com>

    Applied now. Thanks.


    Takashi

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