I'm on Debian/sid too. An issue in libasound2 and libglibmm-2.4-1v5. You want to revert:
libasound2, libasound2-data to 1.1.6-1 libasound2-plugins to 1.1.6-1+b1 libglibmm-2.4-1v5 to 2.56.0-2 And the sound is back. -- Pascal Obry / Magny Les Hameaux (78) The best way to travel is by means of imagination http://www.obry.net gpg --keyserver keys.gnupg.net --recv-key F949BD3B