https://bugs.freedesktop.org/show_bug.cgi?id=77677
--- Comment #27 from bgunteriv@gmail.com --- (In reply to comment #23)
This might be a duplicate of bug 76837. Does disabling dpm help? Append radeon.dpm=0 to the kernel command line in grub.
after some initial testing of different sources, this does seem to help me.
I will continue to test through the week, and let you know if the sound returns.
so far, so good.