I asked about this on the Ubuntu forum but haven’t had any replies yet…
My FiiO E10K USB-DAC was working fine until today. Switching from the Built-In Audio to the USB-DAC in the Sound Preferences has no effect in any application even though Test Speakers works. The only change was a kernel update yesterday, but switching to the older kernel in grub still has no effect. I can get it working in Audacious and VLC by going into the menus and choosing the device, but the volume can’t be controlled from the panel icon. All other apps are not getting sound.
Ubuntu Mate 17.04 64bit Intel Pentium J2900