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Alsa does not do Loopback Mixing
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The_Document
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PostPosted: Mon May 21, 2018 10:31 pm    Post subject: Alsa does not do Loopback Mixing Reply with quote

Doing gentoo install on new laptop and alsa does not do Loopback Mixing because the option is simply unavalable thru Alsamixer,- Beep does not sound, it only runs quietly. Alsa works because speaker-test outputs sound.

Last edited by The_Document on Wed May 23, 2018 2:24 am; edited 2 times in total
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bunder
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PostPosted: Tue May 22, 2018 2:24 am    Post subject: Reply with quote

You need a driver called aloop and a tweaked .asoundrc for loopback.

https://www.alsa-project.org/main/index.php/Matrix:Module-aloop
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The_Document
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PostPosted: Tue May 22, 2018 2:26 am    Post subject: Reply with quote

bunder wrote:
You need a driver called aloop and a tweaked .asoundrc for loopback.

https://www.alsa-project.org/main/index.php/Matrix:Module-aloop


Which kernel option must I enable here?
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bunder
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PostPosted: Tue May 22, 2018 2:30 am    Post subject: Reply with quote

The_Document wrote:
bunder wrote:
You need a driver called aloop and a tweaked .asoundrc for loopback.

https://www.alsa-project.org/main/index.php/Matrix:Module-aloop


Which kernel option must I enable here?


You need a driver called aloop
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The_Document
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PostPosted: Tue May 22, 2018 3:49 am    Post subject: Reply with quote

bunder wrote:
The_Document wrote:
bunder wrote:
You need a driver called aloop and a tweaked .asoundrc for loopback.

https://www.alsa-project.org/main/index.php/Matrix:Module-aloop


Which kernel option must I enable here?


You need a driver called aloop


Is it in main tree?
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Chiitoo
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PostPosted: Tue May 22, 2018 11:21 am    Post subject: ><)))°€ Reply with quote

In 'menuconfig' for example:

Code:
→ Device Drivers → Sound card support → Advanced Linux Sound Architecture → Generic sound devices → Generic loopback driver (PCM)

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The_Document
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PostPosted: Wed May 23, 2018 2:28 am    Post subject: Reply with quote

I don't get enable loopback mixing on main menu from alsamixer, enabling driver only added soundcard calld Loopback which doesn't have any controls.
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bunder
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PostPosted: Wed May 23, 2018 10:38 am    Post subject: Reply with quote

It should have one playback control called PCM. You might need to index the sound cards so your standard sound starts first. I added this to my kernel command line:

Code:
snd_hda_intel.index=0 snd_aloop.index=1


Or maybe you're missing the .asoundrc
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