snd_atiixp oss sound choppy

[Neal Becker <ndbecker2 gmail com>]

I find realplayer unusable on this hardware.  Alsa sound works fine, but
realplay uses oss.  The sound is unusable, because it is so choppy.  I
tried kde control-center/sound system, and tried setting a larger buffer,
but no good.

I have quite a few other computers with different sound hardware on which
the exact same test works fine.

Any ideas?