I now managed to install again nvidia drivers after I had the error that resembles to the one described here https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-440/+bug/1878946
It might be that this sof-cfl.ri fixed this issue also. But maybe nvidia made a patch in the last 2 days.
So the speakers and the mic work on 5.4.0-42-generic with the nvidia drivers also.
I now managed to install again nvidia drivers after I had the error that resembles to the one described here https:/ /bugs.launchpad .net/ubuntu/ +source/ nvidia- graphics- drivers- 440/+bug/ 1878946
It might be that this sof-cfl.ri fixed this issue also. But maybe nvidia made a patch in the last 2 days.
So the speakers and the mic work on 5.4.0-42-generic with the nvidia drivers also.