[Bug 257082] Sound with Scarlett Solo 3rd intermittently cuts off for very short periods of milliseconds.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257082

--- Comment #8 from Hans Petter Selasky <hselasky@FreeBSD.org> ---
Hi,

I see in the log there is a problem with the XHCI controller, not the
Focusrite.

19:56:09.868398 usbus1.2
DONE-ISOC-EP=00000001,SPD=HIGH,NFR=0,SLEN=0,IVAL=0,ERR=TIMEOUT

It looks like it didn't generate a completion event for an isochronous job, so
the isochronous schedule stopped feeding audio.

Try to build a new kernel with:

options USB_DEBUG

added to the kernel config.

Then set for example:

sysctl hw.usb.xhci.debug=17
sleep 10
sysctl hw.usb.xhci.debug=0

Then repeat the test and collect logs from /var/log/messages

--HPS

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