According to your comment 41 I did after a hardreset of the computer: eduard@linux-m4mf:~> pasuspender -- aplay -Dplughw:1 /usr/share/sounds/alsa/test.wav Wiedergabe: WAVE '/usr/share/sounds/alsa/test.wav' : Signed 16 bit Little Endian, Rate: 44100 Hz, stereo eduard@linux-m4mf:~> then I set with pavucontrol headphone unplugged an played sound. The sound is still noisy.