The Unicens driver is creating two 'cardid' for unicens devices. One for inputs (usually hw:ep016ch / hw:2), and one for outputs (usually hw:ep812ch / hw:3). But, only one entry is created in '/dev/snd/by-id'.

This is an issue because 4a uses this entry to get the 'cardid' of an audio card.

The unciens driver should either create only one 'cardid' for inputs and ouputs (this is what is usually done for 'regular' ALSA card), or create two '/dev/snd/by-id' entries.