<html> <head> <style></style> </head> <body class='hmmessage'> I think I have stopped the crackling noise (BUT introduced a new problem, described later) by following some of the advise given on: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/301755?comments=all I added tsched=0 a couple of places: .ifexists module-udev-detect.so load-module module-udev-detect tsched=0 .else load-module module-detect tsched=0 .endif But now pulseaudio seems very unstable. Sometimes when i switch between two audio tracks (in Rhythmbox), pulseaudio seems to go into an eternal rewind loop and crash. /Kim </body> </html>