Same problem on MSI K9AGM2-FIH, same chipset.
$ aplay -L ~<SNIP>~ null Discard all samples (playback) or generate zero samples (capture) iec958:CARD=HDMI,DEV=0 HDA ATI HDMI IEC958 (S/PDIF) Digital Audio Output
Same problem on MSI K9AGM2-FIH, same chipset.
$ aplay -L CARD=HDMI, DEV=0
~<SNIP>~
null
Discard all samples (playback) or generate zero samples (capture)
iec958:
HDA ATI HDMI
IEC958 (S/PDIF) Digital Audio Output