alsa-project/alsa-ucm-conf issue #83 was edited from juliusvonkohout:
Alsainfo: http://alsa-project.org/db/?f=673e04313fa931831176ed3f50a9af1c9206395e
I tested with fedora 33, 34 and Ubuntu 21.04. Only the high frequency speakers at the laptop bottom are working, while the speakers above the keyboard are off. Here is a link to the laptop https://www.lenovo.com/de/de/laptops/yoga/yoga-slim-series/Yoga-Slim-7-15IIL...
In Microsoft Windows 10 everything is fine.
In Ubuntu 21.04 i can at least change the bass speaker volume in alsamixer, but it is changing hardware master volume instead of hardware bass speaker volume.
In Feodra 33 and 34 i can not even change the bass speaker volume in alsamixer 
You can immiediatly hear, that the bass speaker above the keyboard is off [audio.zip](https://github.com/alsa-project/alsa-ucm-conf/files/5973232/audio.zip)
There are related bugs for ALC287 The same bug on other yoga laptops https://bugzilla.kernel.org/show_bug.cgi?id=205755 Patches for the issue on other yoga Laptops https://patchwork.kernel.org/project/alsa-devel/patch/20201205051130.8122-1-...
Issue URL : https://github.com/alsa-project/alsa-ucm-conf/issues/83 Repository URL: https://github.com/alsa-project/alsa-ucm-conf