HDMI Audio Not Working

[unimatrix]

I'll get right to the point. There is no HDMI audio device on Ubuntu 9.10, using fglrx drivers (but it works fine in Windows).

lspci shows the audio device:

02:00.1 Audio device: ATI Technologies Inc HD48x0 audio

aplay -l does not list a HDMI device.
lsmod does not list the HDMI audio module

This is what I found in dmesg:

[ 18.642767] snd_hda_codec_atihdmi: Unknown parameter `index'
[ 18.695543] alloc irq_desc for 29 on node 0
[ 18.695546] alloc kstat_irqs on node 0

Trying to load the snd_hda_codec_atihdmi module manually (sudo modprobe snd_hda_codec_atihdmi) results in a FATAL error:

FATAL: Error inserting snd_hda_codec_atihdmi (/lib/modules/2.6.31-19-generic/kernel/sound/pci/hda/snd-hda-codec-atihdmi.ko): Unknown symbol in module, or unknown parameter (see dmesg)

And in dmesg:

[ 3272.167046] snd_hda_codec_atihdmi: Unknown parameter `index'

What can I do?

[markbuntu]

What card are you using?
I have hdmi with fglrx for my HD3650 and HD3450 cards.

[unimatrix]

Radeon HD 4870 (Sapphire)