[Bug 268136] [snd_uaudio] Distorted audio from MOTU M4 USB interface

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268136

--- Comment #2 from mburetorp <markus.buretorp@gmail.com> ---
According to the manual it's a high-speed device "Available high-speed USB 2.0
(or 3.0) port". It is connected to a blue SS USB port on the motherboard (not a
hub).

Changing default_rate didn't change anything. I also tried changing that in
/etc/sysctl.conf and rebooting.

root@marcus:~ # sysctl hw.usb.uaudio
hw.usb.uaudio.debug: 0
hw.usb.uaudio.buffer_ms: 8
hw.usb.uaudio.default_channels: 0
hw.usb.uaudio.default_bits: 32
hw.usb.uaudio.default_rate: 48000
hw.usb.uaudio.handle_hid: 1

root@marcus:~ # sysctl dev.pcm.4
dev.pcm.4.feedback_rate: 0
dev.pcm.4.mode: 7
dev.pcm.4.bitperfect: 0
dev.pcm.4.buffersize: 0
dev.pcm.4.rec.vchanformat: s16le:2.0
dev.pcm.4.rec.vchanrate: 48000
dev.pcm.4.rec.vchanmode: fixed
dev.pcm.4.rec.vchans: 1
dev.pcm.4.play.vchanformat: s16le:2.0
dev.pcm.4.play.vchanrate: 48000
dev.pcm.4.play.vchanmode: fixed
dev.pcm.4.play.vchans: 1
dev.pcm.4.hwvol_mixer: vol
dev.pcm.4.hwvol_step: 5
dev.pcm.4.%parent: uaudio0
dev.pcm.4.%pnpinfo: 
dev.pcm.4.%location: 
dev.pcm.4.%driver: pcm
dev.pcm.4.%desc: USB audio

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