Thomas Hebb f47413b98c ALSA: doc: Document PC Beep Hidden Register on Realtek ALC256 ... commit f128090491 upstream. This codec (among others) has a hidden set of audio routes, apparently designed to allow PC Beep output without a mixer widget on the output path, which are controlled by an undocumented Realtek vendor register. The default configuration of these routes means that certain inputs aren't accessible, necessitating driver control of the register. However, Realtek has provided no documentation of the register, instead opting to fix issues by providing magic numbers, most of which have been at least somewhat erroneous. These magic numbers then get copied by others into model-specific fixups, leading to a fragmented and buggy set of configurations. To get out of this situation, I've reverse engineered the register by flipping bits and observing how the codec's behavior changes. This commit documents my findings. It does not change any code. Cc: stable@vger.kernel.org Signed-off-by: Thomas Hebb <tommyhebb@gmail.com> Link: https://lore.kernel.org/r/bd69dfdeaf40ff31c4b7b797c829bb320031739c.1585584498.git.tommyhebb@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-04-24 08:00:35 +02:00
..
cards	ALSA: doc: ReSTize img,spdif-in.txt	2016-11-10 22:33:31 +01:00
designs	ALSA: pcm: add a documentation for tracepoints	2017-07-02 11:15:52 +02:00
hd-audio	ALSA: doc: Document PC Beep Hidden Register on Realtek ALC256	2020-04-24 08:00:35 +02:00
kernel-api	ALSA: doc: Update copy_user, copy_kernel and fill_silence PCM ops	2017-06-02 19:38:27 +02:00
oss	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
soc	ASoC: dapm: Add new widget type for constructing DAPM graphs on DSPs.	2017-06-30 11:55:20 +01:00
alsa-configuration.rst	ALSA: doc: ReSTize ALSA-Configuration document	2016-11-10 18:08:44 +01:00
conf.py	docs-rst: add sound book to pdf output	2017-05-16 08:44:07 -03:00
index.rst	ASoC: doc: ReSTize overview.txt	2016-11-11 17:32:48 +01:00