https://bugzilla.suse.com/show_bug.cgi?id=1174622 https://bugzilla.suse.com/show_bug.cgi?id=1174622#c17
--- Comment #17 from Takashi Iwai tiwai@suse.com --- Unfortunately no reaction to my upstream report. So it's little chance to get it fixed magically without action.
And, it's tough to find out the culprit; basically you need to bisect the commits between 4.20 and 5.0.