I have the same problem, however it only occurs at over 133 FSB, my Duron will do all the way up to 160 FSB and prolly further, however the sound will not work at that FSB. I wish I had an answer as well. 🙁 I have version 2.1 that was suppose to be the good one as well. :frown:
EDIT: I might have a fix, don't know yet, have not had the time to completely test it. Here is what I did.
1. Updated the bios to the 04/11/02 bios
2. Removed the C-Media drivers I installed via the CD that came with the motherboard.
3. Ran Windows Update and installed 5.12.1.636 drivers dated 06/04/02.
4. Reboot
5. Sound is now working at an FSB of 160mhz with my Duron. 😀 Again, this is on a revision 2.1 motherboard.
Hope this helps 🙂 If you need help, PM me 😉