Comment 56 for bug 87652

 Hi Scott!

All i can say that sound is now working quite good on my system again with that patch. I don't have a second Mac for testing, and I am also new to this kernel stuff, so I don't have a clue what could cause these plopping noises on your system. There is a disabled printk line in the snd_pmac_pcm_dead_xfer function. You could enable that line, recompile and then "tail -F /var/log/messages" to see how often the DMA transfers die on your system. If they die very often, this might be the cause.