Comment # 1 on bug 1203805 from Takashi Iwai

Could you check whether the issue persists with the latest SLE15-SP4 kernel
build, too?  The package is found in OBS Kernel:SLE15-SP4 repo,
  http://download.opensuse.org/repoisotires/Kernel:/SLE15-SP4/pool/

Note that it's an unofficial build, and it needs Secure Boot turned off.