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Date:      Tue, 16 Oct 2018 14:44:21 +0000
From:      bugzilla-noreply@freebsd.org
To:        usb@FreeBSD.org
Subject:   [Bug 230434] USB sound card fails to record
Message-ID:  <bug-230434-19105-oy4iQDyyoT@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-230434-19105@https.bugs.freebsd.org/bugzilla/>
References:  <bug-230434-19105@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230434

--- Comment #24 from Hans Petter Selasky <hselasky@FreeBSD.org> ---
The RPI3 has some limitation on the ISOCHRONOUS schedule, so you might need to
set:

sysctl dev.pcm.0.rec.vchanrate=32000
sysctl dev.pcm.0.play.vchanrate=32000

In order to use duplex audio!

Or get a HIGH-speed USB audio device.

--HPS

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