dmasound_pmac

I have just installed Fedora Core-2 on my Powerbook G4, but 
I can't get sound to work.  For the install, I followed the
helpful instructions at:
   http://www.bytebot.net/geekdocs/ibook/fedorappc.html
   http://lists.ydl.net/pipermail/fedora-ppc/2004-September/000180.html ,
installed
   http://fedora.linux.duke.edu/fedorappc/FC2 ,
and got sleep to work using 
   ftp://ftp.linux.org.uk/pub/people/dwmw2/fc2-mac/RPMS/pmud-0.10-1.1.ppc.rpm
However, I can't get sound to work.  The startup messages look like:

  Oct 14 15:33:13 delilah kernel: dmasound_pmac: Awacs/Screamer Codec Mfct: 1 Rev 3
  Oct 14 15:33:13 delilah kernel: PowerMac Screamer  DMA sound driver rev 016 installed
  Oct 14 15:33:13 delilah kernel: Core driver edition 01.06 : PowerMac Built-in Sound
driver edition 00.07
  Oct 14 15:33:13 delilah kernel: Write will use    4 fragments of   32768 bytes as
default
  Oct 14 15:33:13 delilah kernel: Read  will use    4 fragments of   32768 bytes as
default
  Oct 14 15:33:14 delilah modprobe: FATAL: Error running install command for sound_slot_1
  Oct 14 15:33:39 delilah modprobe: FATAL: Error running install command for sound_slot_1

Does anyone know how to get sound to work?  I noticed that Colin
Charles on his 12/9/2004 blog says he got it working, but doesn't give
details.

Brett van de Sande