Re: Enable audio through HDMI on GT240
@fuzzy2010: Kill the @hooks section of /etc/asound.conf and kill /etc/alsa/alsactl.conf completely. For good measure, kill the alias lines in /etc/modprobe.d/sound.conf too. Your probe_mask is right; enable_msi is technically not needed anymore but it doesn't hurt. (Of course, make backups of these files!)
Check the output from `lsmod | grep snd'. If snd_hda_codec_nvhdmi isn't loaded, I don't think you'd even see the device, but check anyway. If not loaded, you'll need to load it.