The UX391UA fix is not in 4.20 as it was already a release candidate. To get sound working on this model you'll need to download the 4.20 source, apply the patch to sound/pci/hda/patch_realtek.c then compile and install the kernel.
The UX391UA fix is not in 4.20 as it was already a release candidate. To get sound working on this model you'll need to download the 4.20 source, apply the patch to sound/pci/ hda/patch_ realtek. c then compile and install the kernel.