Comment 6 for bug 335955

while performing system upgrade I did not notice any crackling then rhythmbox played music, so it's not simply system load bug, because upgrade takes a lot of cpu power and causes intensive disk activity

same crackling happens with nv drivers, so it's not related to nvidia proprietary drivers

"pulseaudio -k" and then "pulseaudio -vvvv" gives error then crackling can be heard:
"D: protocol-native.c: Requesting rewind due to end of underrun."

updated bug description and title accordingly