From: Thomas Hebb <tommyhebb@gmail.com>
To: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.or
Cc: "Kailang Yang" <kailang@realtek.com>,
"Thomas Hebb" <tommyhebb@gmail.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Hui Wang" <hui.wang@canonical.com>,
"Jaroslav Kysela" <perex@perex.cz>,
"Jian-Hong Pan" <jian-hong@endlessm.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"Kai-Heng Feng" <kai.heng.feng@canonical.com>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"Sergey Bostandzhyan" <jin@mediatomb.cc>,
"Takashi Iwai" <tiwai@suse.com>,
"Tomas Espeleta" <tomas.espeleta@gmail.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 0/3] Properly fix headphone noise on the XPS 13 and other ALC256 devices
Date: Mon, 30 Mar 2020 03:30:29 -0400 [thread overview]
Message-ID: <cover.1585553414.git.tommyhebb@gmail.com> (raw)
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.
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
Documentation/sound/hd-audio/index.rst | 1 +
Documentation/sound/hd-audio/models.rst | 2 -
.../sound/hd-audio/realtek-pc-beep.rst | 129 ++++++++++++++++++
sound/pci/hda/patch_realtek.c | 49 ++-----
4 files changed, 139 insertions(+), 42 deletions(-)
create mode 100644 Documentation/sound/hd-audio/realtek-pc-beep.rst
--
2.25.2
next reply other threads:[~2020-03-30 7:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 7:30 Thomas Hebb [this message]
2020-03-30 7:30 ` [PATCH 1/3] ALSA: doc: Document PC Beep Hidden Register on Realtek ALC256 Thomas Hebb
2020-03-30 7:30 ` [PATCH 2/3] ALSA: hda/realtek - Set principled PC Beep configuration for ALC256 Thomas Hebb
2020-03-30 7:30 ` [PATCH 3/3] ALSA: hda/realtek - Remove now-unnecessary XPS 13 headphone noise fixups Thomas Hebb
2020-03-31 13:11 ` Sasha Levin
2020-03-30 8:02 ` [PATCH 0/3] Properly fix headphone noise on the XPS 13 and other ALC256 devices Takashi Iwai
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