Sound and DMA on MSI K7D Master

Hi, I recently upgraded my machine to a dual Athlon on an MSI K7D Master motherboard. It works nice, but I have two problems with it. Running the 2.4.16-SMP kernel from the 7.3 update directory, I don't seem to get DMA on the harddrive. It works on the DVD. Is there a known problem with DMA on SMP in 2.4.16? Also, the motherboard has a builtin sound card that I'd like to get running. It's labeled simply as AC97. Is there a generic AC97 (that's DirectSound, isn't it?) driver? I can't seem to find one in the sound card setup. TIA Anders