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segmentation-fault
Tux's lil' helper
Joined: 11 Oct 2016
Posts: 99
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 Posted: Mon Feb 25, 2019 1:08 pm Post subject: Where is ALSA documentation? |
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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)
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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
Administrator
Joined: 05 Jul 2003
Posts: 54234
Location: 56N 3W
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| Posted: Mon Feb 25, 2019 2:07 pm Post subject: |
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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.
_________________
Regards,
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
Tux's lil' helper
Joined: 11 Oct 2016
Posts: 99
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| Posted: Mon Feb 25, 2019 7:32 pm Post subject: |
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| NeddySeagoon wrote: |
What is it you want to install?
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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)
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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
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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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Joined: 05 Jul 2003
Posts: 54234
Location: 56N 3W
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| Posted: Mon Feb 25, 2019 11:05 pm Post subject: |
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segmentation-fault,
Somebody has to be first with new hardware - congratulations, this time it was you :)
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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