Thank you so much!!! This solved my issue. Cheers!
# My software versions and GPU.
unRAID 6.6.7
Ubuntu 18.04.2 LTS Virtual Machine
GPU pass-through with 'ASUS GeForce GTX 1050 Ti PH-GTX1050TI-4G'
# From within the Ubuntu Guest OS, I did the following:
[1] Created the file.
sudo touch /etc/modprobe.d/snd-hda-intel.conf
[2] Opened the file with nano text editor.
sudo nano /etc/modprobe.d/snd-hda-intel.conf
[3] Added the following line, saved, and closed.
options snd-hda-intel enable_msi=1
[4] Rebooted and issue was fixed!!!
