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Message-ID: <s5h7dz09a2x.wl-tiwai@suse.de>
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
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