Comment 0 for bug 1905132

My output sound device "Lenovo Family 17h" worked well in Ubuntu 20.04.
"System => Sound => Output Device" shows only "Dummy Output".
device: IdeaPad-5-14ARE05
Checked it with different kernels and it is not kernel related
problem since upgrade of libasound, so we set back to older version

cat /prod/asound/cards

 0 [Generic ]: HDA-Intel - HD-Audio Generic
                      HD-Audio Generic at 0xd04c8000 irq 90
 1 [Generic_1 ]: HDA-Intel - HD-Audio Generic
                      HD-Audio Generic at 0xd04c0000 irq 91
 2 [acp ]: acp - acp
                      LENOVO-81YM-IdeaPad514ARE05-LNVNB161216

we figured it to be no pulse problem but with alsa

solution:

sudo apt install libasound2=1.2.2-2.1 libasound2-data=1.2.2-2.1 libasound2:i386=1.2.2-2.1 libatopology2=1.2.2-2.1

to prevent from upgrades again:

echo libasound2 hold | sudo dpkg --set-selections