Comment 16 for bug 1859754

For 18.04 and 19.10, the alsa-lib only supports ucm, Intel audio team write the ucm confs and this is sth I plan to SRU to Eoan and Bionic in this bug.

For 20.04, we choose alsa-lib-, it supports ucm2, and upstream writes the ucm2 confs based on the Intel audio team's work, we use #1862505 to track it.

So the ucm for bionic and eoan is not backported from ucm2 of, it is maintained by Intel:

the ucm2 for focal is maintained by upstream:, it is written based on the Intel's work.