Here is what I needed to do to get my audio devices found by my Kubuntu 20.04 focal installation.
First install this patch, and see if things start working: https://launchpad.net/~kaihengfeng/+archive/ubuntu/fix-lp1869819
If not then follow the instructions:
sudo apt install alsa-tools-gui
Run hdajackretask
Parser hints > jack_detect = no
Apply now
Install boot override