Comment 137 for bug 301755

As a general recommendation, if you have different hardware, the cause of the bugs can be different, so go through the list at https://wiki.ubuntu.com/DebuggingSoundProblems/KarmicCaveats and see if anything applies to your situation. If that doesn't help, file a separate bug using the "ubuntu-bug -p pulseaudio" terminal command. Also, if you have time to check whether it is fixed in the latest development snapshot (i e Lucid, currently), that will be most helpful. Thank you!