Thanks. It shows the error [ 6.448531] snd_hda_intel 0000:07:00.6: no codecs found! and that's the crucial error. It means that, by some reason, HD-audio controller didn't get the codec information. Possibly related with some power management stuff. Did the sound work on Leap 15.4 in the past? If it's a regression, it'd be helpful to narrow down the regression range.