linux-kernel - Re: [PATCH v2 0/3] Properly fix headphone noise on the XPS 13 and other ALC256 devices

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Date:   Tue, 31 Mar 2020 10:56:22 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Thomas Hebb <tommyhebb@...il.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Kailang Yang <kailang@...ltek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hui Wang <hui.wang@...onical.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Jian-Hong Pan <jian-hong@...lessm.com>,
        Jonathan Corbet <corbet@....net>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Sergey Bostandzhyan <jin@...iatomb.cc>,
        Takashi Iwai <tiwai@...e.com>,
        Tomas Espeleta <tomas.espeleta@...il.com>,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Properly fix headphone noise on the XPS 13 and other ALC256 devices

On Mon, 30 Mar 2020 18:09:36 +0200,
Thomas Hebb wrote:
> 
> 
> The root cause of various pervasive audio problems on the XPS 13
> 9350/9360, mostly relating to the headphone jack, turns out to be an
> undocumented feature of the ALC256 and similar codecs that routes audio
> along paths not exposed in the HDA node graph. The best we've had so far
> to configure this feature is magic numbers provided by Realtek, none of
> which have fully fixed all issues.
> 
> This series documents the "PC Beep Hidden Register", which controls the
> feature and which I've reverse engineered using black box techniques,
> and uses my findings to hopefully fix the headphone issues on my XPS 13
> once and for all.
> 
> Changes in v2:
> - Change fixed value from 0x4727 to 0x5757, which should behave
>   identically, on advice from Kailang.
> 
> Thomas Hebb (3):
>   ALSA: doc: Document PC Beep Hidden Register on Realtek ALC256
>   ALSA: hda/realtek - Set principled PC Beep configuration for ALC256
>   ALSA: hda/realtek - Remove now-unnecessary XPS 13 headphone noise
>     fixups

Now applied all three patches.  The patch 2 had an incorrect Fixes tag
(pointing to the stable commit instead of the original commit) so I
corrected locally.


thanks,

Takashi