About 50% of the times when I boot up Volumio (RPi3 + Hifiberry AMP+ + WiFi connection) the device just stays dead silent no matter what radio or song I play.
I checked the error log (journalctl -f) and it says (once per second):
Sep 08 07:10:43 volumio volumio: amixer: Unable to find simple control 'Master',0 Sep 08 07:10:44 volumio volumio: amixer: Unable to find simple control 'Master',0
I guess this means that the Hifiberry device is “not found”…?
I have to reboot a couple of times, and then the problem is gone and the sound works. Could it be a hardware problem? I think it’s unlikely.
What more debugging can I do to try to find a remedy for the problem? Any suggestions?
I attach a screenshot of my playback options.