[Bug 174835] [uaudio] uaudio fails to create pcm/dsp device file

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 24 Oct 2024 01:35:34 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=174835

Florian Walpen <dev@submerge.ch> changed:

           What    |Removed                     |Added
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                 CC|                            |dev@submerge.ch

--- Comment #7 from Florian Walpen <dev@submerge.ch> ---
> Device has 4 channels output, 2 channels input, but on mixer only 2 channels as 1x 
> stereo is recognized as pcm, vol.

Try to set

sysctl dev.pcm.5.play.vchanformat=s24le:4.0
sysctl dev.pcm.5.rec.vchanformat=s24le:2.0

to enable 24bit sound quality and 4 channel playback. Not many applications
support 4 channel playback though. You could use virtual_oss to split it into
two stereo pcm devices, if that's what you want.

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