New to the forums here, well new to posting anyways.
I've been working on this very issue myself, and seem to have found a solution that works for me.
I installed the alsa-driver.i386 via yum, which will also pull down an alsa-kmdl-* dependancy.
I had to enable atrpms to get this (could have installed via rpm but yum is so much more efficient.)
After a reboot, and it's much better. No more stuttering! The only minor downside is the audio does a brief rush right off the start when watching videos, for a second or two, then it all seems to settle down and looks and sounds fine.
Hope this is helpful to someone else, as it's been a challenging evening trying to get this annoying situation resolved.