[xubuntu] Stubborn audio glitch - new computer

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http://ubuntuforums.org – Hello all. :D Using my new laptop - Samsung 305 series + Xubuntu 11.10 - for playing music and videos, I encounter a problem. There is an annoying digital-sounding squeal coming from the speakers at all times. Nothing I have tried has made any difference whatsoever, which includes: Using a different media player: Parole, mplayer, audacity - the sound also persists when there is no audio playing at all. Changing every volume-control and mute option I can find in xfce4-mixer and pavucontrol: the noise does not change volume with the audio. Pulseaudio: The noise is not interrupted by pulsesud (Hardware)