2010/8/20 Stephen Warren swarren@nvidia.com
The Azalia controller on NVIDIA GPUs gives 4 ALSA hw devices:
(on card 1):
[swarren@swarren-lx2 ~]$ sudo aplay -l **** List of PLAYBACK Hardware Devices **** card 0: NVidia [HDA NVidia], device 0: ALC1200 Analog [ALC1200 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: NVidia [HDA NVidia], device 3: ALC1200 Digital [ALC1200 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: NVidia_1 [HDA NVidia], device 3: NVIDIA HDMI [NVIDIA HDMI] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: NVidia_1 [HDA NVidia], device 7: NVIDIA HDMI [NVIDIA HDMI] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: NVidia_1 [HDA NVidia], device 8: NVIDIA HDMI [NVIDIA HDMI] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: NVidia_1 [HDA NVidia], device 9: NVIDIA HDMI [NVIDIA HDMI] Subdevices: 1/1 Subdevice #0: subdevice #0
... all of which appear to work OK.
However, the list of available "PCMs" from aplay -L doesn't expose them all:
[swarren@swarren-lx2 ~]$ sudo aplay -L front:CARD=NVidia,DEV=0 HDA NVidia, ALC1200 Analog Front speakers surround40:CARD=NVidia,DEV=0 HDA NVidia, ALC1200 Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=NVidia,DEV=0 HDA NVidia, ALC1200 Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=NVidia,DEV=0 HDA NVidia, ALC1200 Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=NVidia,DEV=0 HDA NVidia, ALC1200 Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=NVidia,DEV=0 HDA NVidia, ALC1200 Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers hdmi:CARD=NVidia,DEV=0 HDA NVidia, ALC1200 Digital HDMI Audio Output null Discard all samples (playback) or generate zero samples (capture) pulse Playback/recording through the PulseAudio sound server hdmi:CARD=NVidia_1 HDA NVidia, NVIDIA HDMI HDMI Audio Output
Similarly, pulseaudio only shows one output for the GPU; I assume it uses the same enumeration mechanism for ALSA sinks as "aplay -L".
AFAIK , pulseaudio hardcoded the device name and you can see PA probe hdmi even when the card is intel8x0 (e.g. using intel8x0 inside VirtualBox)
Instead, I imagined that I'd see 4 PCMs listed by "aplay -L"; one for each converter. Is this an incorrect assumption? How would I make that happen?
Do you mean that you have 4 hdmi out on your motherboard ?