sound stopped working - "Dummy Output"

on ubuntu 20.04 sound was working fine. About kernel 5.4.0-47 or -48 sound stopped working getting "Dummy Output" which apparently indicates driver failed to load. I tried the 20.20 Beta live cd and sound worked there. I loaded 20.20 beta and
sound doesn't work while running full system.

All the jillion try this things I have seen, had no effect. Following
https://help.ubuntu.com/community/SoundTroubleshootingProcedureffect.
I downloaded and ran the alsa-info.sh script. It put output at
http://alsa-project.org/db/?f=f5ad3caf1e48bc25a9b1a8be8a2d7a146603fbb0
hope you can help. I had high hopes when sound worked on the 20.20 live cd.
but the 20,20 beta I downloaded and installed on 3 Oct 2020 didn't restore sound.

I have been trying mainly chrome played video to speakers on my hp Pavilion laptop with sound to speakers.
The diagnosing was with sound up/down hot keys, but Sound Settings, pavucontrol both show same dummy mixer.
 alsamixer seems to get some data elsewhere and reports Card: HDA Intel PCH, Chip Realtek ALC295