Long thread, hard to remember now, but--

Did you ever check your IRQ table, specifically to look for shares with Video and/or soundcard?

I still suspect that issue here, having seen it too many times in the field. Have always found that getting the soundcard on its own IRQ solves stuttering audio and sometimes this kind of video stuttering. Of course, the laptop IRQs are hardwired so there's little chance of changing that, but sometimes choosing a different aftermarket soundcard type can be effective. For example, a pcmcia slot that shares with video is bad, but replacing the sound device with a USB type can often be the cure.


--Mac