No Mixer Control available (Volumio 2 / 0.979)

Volumio Development Bug reports
1

With choosen HifiBerry Dac MixerControl doesn´t work.
If choosing MixerControl in settings it toggles between a line and a field.

2

It’s because your DAC doesn’t support hardware mixer. A software mixer is coming ! Please wait a bit.

3

Thanks!
Is there a list of known bugs? It would be easier for developer and user (searching, writing, answering).

4

have a look here : https://github.com/volumio/Volumio2/issues