[Bug 291639] CM6631A USB audio device only works in 48kHz

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 13 Dec 2025 23:50:18 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291639

            Bug ID: 291639
           Summary: CM6631A USB audio device only works in 48kHz
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: usb@FreeBSD.org
          Reporter: reimu@sudomaker.com

Created attachment 266165
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=266165&action=edit
usbconfig

Hi everyone.

I have a CM6631A USB to SPDIF dongle. On FreeBSD 15.0-RELEASE it only works in
the 48000Hz sampling rate.

Setting the sampling rate to anything else will produce distorted sound
(continuous crackings and wrong pitch).

I have fiddled with various sysctl dev.pcm knobs, and none of them helped.

Also, enabling bitperfect will prevent pulseaudio from opening this device.

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