Comment # 1 on bug 1182535 from Takashi Iwai

It's possible that Leap15.2 / SLE15-SP2 kernel still miss some support for the
recent AMD platforms.  Leap15.3 / SLE15-SP3 should work better in this regard.

In anyway, please give more details.  The full dmesg output and the output of
hwinfo would be helpful.