Hello Sorry I didn't have the time to investigate recently. With testing of 18.05.06 it's working as expected so imho you can close this bug. But I really don't know which change / which package solved this ... Thank everyone for the effort! Christoph Pfister Used packages now: libasound2 1.0.11-3 libarts1c2a 1.5.2-1 libsdl1.2debian-alsa 1.2.9-5+b1