Bonjour everybody
My today problem seems to be very well known by the Linux community.
As I'm a very new Linux user I encounter quite some difficulties. But I manage...
I read quite a lot of Q/A on this matter.

I copyied bytcr-rt5640 files (2 files HIFI and .conf)
I played with alsa reload, pulseaudio ====> no result

It seems to me that in my case I have only one sound module (or card)(Intel HDMI/DP LPE Audio) Got this info by: alsamixer and I think I should get more

I upgraded alsamixer using dkms : sudo apt-get install dkms ==> no result then

So as you can understand, I'm not specialist, Imade quite a lot of trials but I remain into trouble (no panic, I'm not in danger of death !!!).

I hope somebody will understand my case.
A hint for the solution would be greatly apreciated.
Thanks
Francois