No Hdmi audio on 12.04

Hi,

I think I stuffed up my alsa configuration.

I used the details on the following link http://www.stchman.com/alsa_update.html to update alsa drivers.

Now no hdmi audio is detected on hardware settings tab.

I can see the the two hdmi audio channels when do 'sudo aplay -l' but cannot open alsamixer. It gives me the error "cannot open mixer".

Please help me. I am a newbie to ubuntu.

Thanks in advance,