This morning I received an email from M2Tech with a fix to the sound issue on
Linux systems. I have tested it and it appears to work - even after a reboot.
It appears that something called udev is muting the two clock selectors. To fix this:
Open a terminal and type in
alsamixer
When the ALSAMIXER settings panels appears click on
F6
Select the
hiFace DAC from the list of soundcards.
Use the
M key to toggle the mute function so that you see the following:
You should now get sound, and even after you reboot, the sound should still be there.
Bizarrely, this doesn't work for the iFi iDAC!
Many thanks to Pietro at M2Tech for sorting this out, and I can confirm that the hiFace DAC sounds very good with Audiophile Linux (Jack/Deadbeef)