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-1.2.1.2, 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 1.2.1.2, it is maintained by Intel: https://github.com/thesofproject/alsa-ucm-conf.git

the ucm2 for focal is maintained by upstream: https://github.com/alsa-project/alsa-ucm-conf.git, it is written based on the Intel's work.