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

--- Comment #18 from Tomasz "CeDeROM" CEDRO <[email protected]> ---
Thanks JRO, if the vchanmode is fixed there will be no change, you may want to
set (in /etc/sysctl.conf so its set on boot) it to passthrough or adaptive to
see the difference.

The test scenario to see what changes in PCM configuration with sysctl:
1. Dump pcm's sysctl before Xorg start, so you will see state before PulseAudio
is started and reconfigures device, for instance in console before startx.
2. Start Xorg and play some audio to make PulseAudio start, there may be change
in PCM configuration by PulseAudio after pcm's sysctl dump.
3. Quit Xorg back to console and killall pulseaudio or call pactl exit, then
dump pcm's sysctls again to see if/how these were reverted.

The above test may show if / what pcm configuration change happens before pulse
audio runs, while pulse audio runs, and after pulse audio exit. This may show
if `pactl exit` changes something noticeably.

Another idea could be increasing hw.usb.uaudio.debug then hw.usb.debug level to
see if any obvious errors occur on the bus or in the uaudio driver.

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