mplayer and hwac3

[David Vernon]

I have a box that is running fc2. If it is running kernel 2.6.8-1.521
then the following command works like a charm.

mplayer -vo vesa:vidix -fs -zoom -double -ao alsa -ac hwac3 -aid 128
dvd://1

When i try the same command with the 2.6.9 or 2.6.10 update kernels I
get no sound and the following error from mplayer.

ALSA lib pcm.c:1851:(snd_pcm_open_conf) Invalid type for PCM
iec958:AES0=0x2,AES1=0x82,AES2=0x0,AES3=0x2 definition (id: iec958,
value: cards.pcm.iec958)
alsa-init: playback open error: Invalid argument
Could not open/initialize audio device -> no sound.

Any help starting to track this down would be appreciated.

Dave