With a fresh Ubuntu 9.10 install the same problem seems to exist.
I've searched half of the Internet for problems with my ION motherboard and why
HDMI audio output wouldn't work (I'm adding these keywords on purpose so one
could google into this topic) - it turned out the audio over HDMI was just
muted.
I'm using nvidia-glx-185 drivers drivers (actually 185.18.36-0ubuntu9)
which come by default with Ubuntu 9.10.
$ aplay -l && aplay -L
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC662 rev1 Analog [ALC662 rev1 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 1: ALC662 rev1 Digital [ALC662 rev1 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 3: NVIDIA HDMI [NVIDIA HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
front:CARD=NVidia,DEV=0
HDA NVidia, ALC662 rev1 Analog
Front speakers
surround40:CARD=NVidia,DEV=0
HDA NVidia, ALC662 rev1 Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=NVidia,DEV=0
HDA NVidia, ALC662 rev1 Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=NVidia,DEV=0
HDA NVidia, ALC662 rev1 Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=NVidia,DEV=0
HDA NVidia, ALC662 rev1 Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=NVidia,DEV=0
HDA NVidia, ALC662 rev1 Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=NVidia,DEV=0
HDA NVidia, ALC662 rev1 Digital
IEC958 (S/PDIF) Digital Audio Output
hdmi:CARD=NVidia,DEV=0
HDA NVidia, NVIDIA HDMI
HDMI Audio Output
null
Discard all samples (playback) or generate zero samples (capture)
pulse
Playback/recording through the PulseAudio sound server
$
--
digital audio optical out (IEC958) will not unmute/turn on
https://bugs.launchpad.net/bugs/441746
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