I have a couple of Raspberry Pi 4B models.
I have one with Opensuse 15.2 and I have the MATE desktop - every thing works except the sound.
The other is running Ubuntu 20.04 and it has sound but it is a restricted OS.
It is also one kernel release ahead.
Opensuse say the Pi4 is a WIP. No sound hardware shows in Opensuse.
Is the sound for the kernel a .ko module - can I copy the .ko from Ubuntu and get sound working in Opensuse?