[Bug 287813] USB headset not properly initialized

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287813

--- Comment #16 from J.R. Oldroyd <fbsd@opal.com> ---
Except for the test I did for you earlier, I have vchanmode set to fixed. 
Nothing at all changes between the before pactl and after pactl runs:

/* run Google Meet in firefox and close it, after which dongle enters repeating
Disconnected/Connected loop and mplayer no longer plays properly */
$ /sbin/sysctl dev.pcm.2
dev.pcm.2.feedback_rate: 0
dev.pcm.2.mixer.mute_3.desc:
dev.pcm.2.mixer.mute_3.max: 1
dev.pcm.2.mixer.mute_3.min: 0
dev.pcm.2.mixer.mute_3.val: 0
dev.pcm.2.mixer.vol_2.desc:
dev.pcm.2.mixer.vol_2.max: 2304
dev.pcm.2.mixer.vol_2.min: -3072
dev.pcm.2.mixer.vol_2.val: -448
dev.pcm.2.mixer.mute_1.desc:
dev.pcm.2.mixer.mute_1.max: 1
dev.pcm.2.mixer.mute_1.min: 0
dev.pcm.2.mixer.mute_1.val: 0
dev.pcm.2.mixer.vol_0.desc:
dev.pcm.2.mixer.vol_0.max: 1280
dev.pcm.2.mixer.vol_0.min: -10240
dev.pcm.2.mixer.vol_0.val: -448
dev.pcm.2.mode: 7
dev.pcm.2.bitperfect: 0
dev.pcm.2.buffersize: 0
dev.pcm.2.rec.vchanformat: s16le:2.0
dev.pcm.2.rec.vchanrate: 48000
dev.pcm.2.rec.vchanmode: fixed
dev.pcm.2.rec.vchans: 1
dev.pcm.2.play.vchanformat: s16le:2.0
dev.pcm.2.play.vchanrate: 48000
dev.pcm.2.play.vchanmode: fixed
dev.pcm.2.play.vchans: 1
dev.pcm.2.hwvol_mixer: vol
dev.pcm.2.hwvol_step: 5
dev.pcm.2.%iommu:
dev.pcm.2.%parent: uaudio0
dev.pcm.2.%pnpinfo:
dev.pcm.2.%location:
dev.pcm.2.%driver: pcm
dev.pcm.2.%desc: vendor 0x0b0e BTV5.2
$ pactl exit
W: [] caps.c: Normally all extra capabilities would be dropped now, but that's
impossible because PulseAudio was built without capabilities support.
$ /sbin/sysctl dev.pcm.2
dev.pcm.2.feedback_rate: 0
dev.pcm.2.mixer.mute_3.desc:
dev.pcm.2.mixer.mute_3.max: 1
dev.pcm.2.mixer.mute_3.min: 0
dev.pcm.2.mixer.mute_3.val: 0
dev.pcm.2.mixer.vol_2.desc:
dev.pcm.2.mixer.vol_2.max: 2304
dev.pcm.2.mixer.vol_2.min: -3072
dev.pcm.2.mixer.vol_2.val: -448
dev.pcm.2.mixer.mute_1.desc:
dev.pcm.2.mixer.mute_1.max: 1
dev.pcm.2.mixer.mute_1.min: 0
dev.pcm.2.mixer.mute_1.val: 0
dev.pcm.2.mixer.vol_0.desc:
dev.pcm.2.mixer.vol_0.max: 1280
dev.pcm.2.mixer.vol_0.min: -10240
dev.pcm.2.mixer.vol_0.val: -448
dev.pcm.2.mode: 7
dev.pcm.2.bitperfect: 0
dev.pcm.2.buffersize: 0
dev.pcm.2.rec.vchanformat: s16le:2.0
dev.pcm.2.rec.vchanrate: 48000
dev.pcm.2.rec.vchanmode: fixed
dev.pcm.2.rec.vchans: 1
dev.pcm.2.play.vchanformat: s16le:2.0
dev.pcm.2.play.vchanrate: 48000
dev.pcm.2.play.vchanmode: fixed
dev.pcm.2.play.vchans: 1
dev.pcm.2.hwvol_mixer: vol
dev.pcm.2.hwvol_step: 5
dev.pcm.2.%iommu:
dev.pcm.2.%parent: uaudio0
dev.pcm.2.%pnpinfo:
dev.pcm.2.%location:
dev.pcm.2.%driver: pcm
dev.pcm.2.%desc: vendor 0x0b0e BTV5.2

I saved and diffed the two outputs.  They're the same.

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