I have my Linux machine connected to my HDTV through a HDMI cable which provides video and 7.1 surround sound. Music, movies, and Steam games all produce sound out of the HDMI connection. I cannot get Mame sounds out of the HDMI connection but it does come out of the headphone jack connection in the front of the PC. How can I get Mame to output the sounds to my HDMI connection? Audacity lists it as HDA NVidia: HDMI 0 (hw:1,3) and another program shows it as ALSA:hdmi:CARD=NVidia,DEV=1.

$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
default
Playback/recording through the PulseAudio sound server
sysdefault:CARD=SB
HDA ATI SB, ALC887-VD Analog
Default Audio Device
front:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
Front speakers
surround40:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
hdmi:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Digital
HDMI Audio Output
dmix:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
Direct sample mixing device
dmix:CARD=SB,DEV=3
HDA ATI SB, ALC887-VD Digital
Direct sample mixing device
dsnoop:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
Direct sample snooping device
dsnoop:CARD=SB,DEV=3
HDA ATI SB, ALC887-VD Digital
Direct sample snooping device
hw:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
Direct hardware device without any conversions
hw:CARD=SB,DEV=3
HDA ATI SB, ALC887-VD Digital
Direct hardware device without any conversions
plughw:CARD=SB,DEV=0
HDA ATI SB, ALC887-VD Analog
Hardware device with all software conversions
plughw:CARD=SB,DEV=3
HDA ATI SB, ALC887-VD Digital
Hardware device with all software conversions
hdmi:CARD=NVidia,DEV=0
HDA NVidia, HDMI 0
HDMI Audio Output
hdmi:CARD=NVidia,DEV=1
HDA NVidia, HDMI 1
HDMI Audio Output
dmix:CARD=NVidia,DEV=3
HDA NVidia, HDMI 0
Direct sample mixing device
dmix:CARD=NVidia,DEV=7
HDA NVidia, HDMI 1
Direct sample mixing device
dsnoop:CARD=NVidia,DEV=3
HDA NVidia, HDMI 0
Direct sample snooping device
dsnoop:CARD=NVidia,DEV=7
HDA NVidia, HDMI 1
Direct sample snooping device
hw:CARD=NVidia,DEV=3
HDA NVidia, HDMI 0
Direct hardware device without any conversions
hw:CARD=NVidia,DEV=7
HDA NVidia, HDMI 1
Direct hardware device without any conversions
plughw:CARD=NVidia,DEV=3
HDA NVidia, HDMI 0
Hardware device with all software conversions
plughw:CARD=NVidia,DEV=7
HDA NVidia, HDMI 1
Hardware device with all software conversions

Anyone have any ideas?

BW

When I use my HDMI cable to connect my laptop to my TV I have to tell Linux that I want to use HDMI as the audio output rather than the system speakers (headphones in your case). I'd be willing to bet that's all you have to do to fix this.