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segmentation-fault
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Joined: 11 Oct 2016
Posts: 17

PostPosted: Mon Feb 25, 2019 1:08 pm    Post subject: Where is ALSA documentation? Reply with quote

I have made a fair attempt to find various files of the ALSA documentation mentioned in guides, wikis etc. on my system, to no avail:

Code:

cd /usr/src/linux
find ./ -name HD-Audio.txt

(no output)

find /usr/share/doc/alsa* -name HD-Audio.txt

(no output)

for p in media-libs/alsa-lib media-libs/alsa-oss media-libs/libclalsadrv media-plugins/alsa-plugins media-sound/alsa-tools media-sound/alsa-utils media-sound/alsamixergui; do equery files $p | grep HD-Audio; done

(no output)


I also searched here for 'alsa documentation', but found no answers other than 'it seems that kernel documentation is being reworked' - from 2017. So the question seems justified:

Where is the ALSA documentation? I mean files like


  • ALSA-Configuration.txt
  • alsa-parameters.txt
  • HD-Audio-Models.txt
  • HD-Audio.txt


You can find them online in places like

https://www.mjmwired.net/kernel/Documentation/sound/alsa/

but what do I have to do to install them on my system?
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W

PostPosted: Mon Feb 25, 2019 2:07 pm    Post subject: Reply with quote

segmentation-fault,

Poke about in /usr/src/linux/Documentation/sound/

What is it you want to install?
To install and configure ALSA follow the wiki.

Post back with any problems.
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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segmentation-fault
n00b
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Joined: 11 Oct 2016
Posts: 17

PostPosted: Mon Feb 25, 2019 7:32 pm    Post subject: Reply with quote

NeddySeagoon wrote:

What is it you want to install?


Well, for me all is well now, but I guess I had to go a few extra rounds, see my How to configure ALSA on ASUS ROG G752 adventures. The problem with the wiki is this: you are told to find your codec and then decide which driver is right for you, on the basis of an obscure 'ALSA Matrix'. My card(s) are:

Code:

lspci | grep -i audio

00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31)
01:00.1 Audio device: NVIDIA Corporation GM204 High Definition Audio Controller (rev a1)


This does not help me to find the card/codec/whatever in a 'Matrix' like this:

https://www.alsa-project.org/wiki/Matrix:Vendor-Intel

Where is 'Sunrise Point-H' in that list?

Anyway, at some point ones realizes that his 'codec' is "Realtek ALC668":

Code:

cat /proc/asound/card0/codec#0 | head -n 5

Codec: Realtek ALC668
Address: 0
AFG Function Id: 0x1 (unsol 1)
Vendor Id: 0x10ec0668
Subsystem Id: 0x10431ced


and the right driver is snd_hda_intel - so far so good. The problems begin when one realizes that the jacks (headphones/speakers/whatever) are not quite exactly represented in alsamixer - and that this might be corrected with the right options to snd_hda_intel. So the question then becomes: what are the right parameters for snd_hda_intel and codec ALC668?

At this point, the Gentoo ALSA Wiki does not help, so one searches the Internet - and all pages one finds refer to ALSA documents like the ones I mentioned:


  • ALSA-Configuration.txt
  • alsa-parameters.txt
  • HD-Audio-Models.txt
  • HD-Audio.txt


This is probably because questions of today get the top answers of the past - which use the documentation of the past at their time. So, instead of, say, HD-Audio.txt, one should look into

/usr/src/linux/Documentation/sound/hd-audio/models.rst

but I would NEVER find this, if I would not look for 'ALC66' exactly:

Code:
find /usr/src/linux/Documentation/ -type f -print0 | xargs -0 grep -i -l 'ALC66'


Thanks for the pointer - I can now play with the up-to-date parameters of models.rst. :-)
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NeddySeagoon
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PostPosted: Mon Feb 25, 2019 11:05 pm    Post subject: Reply with quote

segmentation-fault,

Somebody has to be first with new hardware - congratulations, this time it was you :)
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NeddySeagoon

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