location-dependent laptop audio glitches

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http://crunchbanglinux.org – okay, this is something that i have no idea what is causing it or what is happening or whatever, so i hope somebody here has a clue.the audio on my laptop works just fine. however, when i move it to my parents' house and plug it in over there, it starts glitching. the glitches only seem to happen inside the music software i use, Renoise. when connecting through Jack i get plenty of xruns (audio-stream interruptions).of course i asked on the Renoise-forums first, but there seem to be little to no real ideas of what is going on. so i was hoping i'd have more luck over here...when i thi (HowTos)