Fwd: Linux Kernel 5.12.10 Walkman USB DAC support issues

Hello,

Since updating from 5.10.17, I have not been able to get my Walkman
A55 to work as a USB DAC with my device. My system specs are as
follows:

Surface Pro 4
Pop_OS 21.04 x86_64
Kernel 5.12.10-surface
CPU Intel i5-6300U
Mem 4GB

I can switch back to 5.10.17-surface which I have done and the USB DAC
starts working again. This issue has also been reported in
https://bbs.archlinux.org/viewtopic.php?id=264051&p=2

I'm pretty amateur at linux, but happy to help and provide more
information if required. I guess this is a niche issue as it's not
been reported as far as I can tell.

Desmg output is attached as your spam filter intercepted the raw
information in the email.

Kind regards,

Neil