Comment # 34 on bug 1195313 from Takashi Iwai

Good to hear.  I'm not sure what actually triggered the new problems, but
please try to catch up all pending online updates at first.  If the problem
persists after the full updates, let's continue to evaluate, but maybe it'd be
better to open other bug reports.

FWIW, the device should be supported by Leap 15.4 kernel (available in OBS
Kernel:SLE15-SP4 kernel), too.  But you already succeeded the newer kernel
installation, so no need to retest with others :)