On Fri, 10 Sep 2021 11:45:10 -0700
Jack Craig <jack.craig.ap...@gmail.com> wrote:

> i see ...
> 
>  aplay -L
> null
>     Discard all samples (playback) or generate zero samples (capture)
> samplerate
>     Rate Converter Plugin Using Samplerate Library
> pipewire
>     PipeWire Sound Server
> upmix
>     Plugin for channel upmix (4,6,8)
> vdownmix
>     Plugin for channel downmix (stereo) with a simple spacialization
> default
>     Default ALSA Output (currently PipeWire Media Server)
> hdmi:CARD=NVidia,DEV=0
>     HDA NVidia, HDMI 0
>     HDMI Audio Output
> hdmi:CARD=NVidia,DEV=1
>     HDA NVidia, HDMI 1
>     HDMI Audio Output
> hdmi:CARD=NVidia,DEV=2
>     HDA NVidia, HDMI 2
>     HDMI Audio Output
> hdmi:CARD=NVidia,DEV=3
>     HDA NVidia, HDMI 3
>     HDMI Audio Output
> hdmi:CARD=NVidia,DEV=4
>     HDA NVidia, HDMI 4
>     HDMI Audio Output
> usbstream:CARD=NVidia
>     HDA NVidia
>     USB Stream Output
> [jackc@ws ~ $ aplay -lv
> **** List of PLAYBACK Hardware Devices ****
> card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: NVidia [HDA NVidia], device 10: HDMI 4 [HDMI 4]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> 
> snd                   110592  10
> snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_timer,snd_pcm
> snd_hda_codec         172032  2 snd_hda_codec_hdmi,snd_hda_intel
> snd_hda_codec_hdmi     73728  1
> snd_hda_core          110592  3
> snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
> snd_hda_intel          57344  1
> snd_hrtimer            16384  0
> snd_hwdep              16384  1 snd_hda_codec
> snd_intel_dspcfg       28672  1 snd_hda_intel
> snd_intel_sdw_acpi     20480  1 snd_intel_dspcfg
> snd_pcm               135168  4
> snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core
> snd_seq                90112  1 snd_seq_dummy
> snd_seq_device         16384  1 snd_seq
> snd_seq_dummy          16384  0
> snd_timer              49152  3 snd_seq,snd_hrtimer,snd_pcm
> soundcore              16384  1 snd

The proper audio codecs are all loaded.
> 
> 03:00.0 VGA compatible controller: NVIDIA Corporation GK208B [GeForce
> GT 730] (rev a1)
> 03:00.1 Audio device: NVIDIA Corporation GK208 HDMI/DP Audio
> Controller (rev a1)

The proper video controller is loaded
> 
> cat /proc/asound/devices
>   1:        : sequencer
>   2: [ 0- 3]: digital audio playback
>   3: [ 0- 7]: digital audio playback
>   4: [ 0- 8]: digital audio playback
>   5: [ 0- 9]: digital audio playback
>   6: [ 0-10]: digital audio playback
>   7: [ 0- 0]: hardware dependent
>   8: [ 0]   : control
>  33:        : timer

The aplay -lv and this agree, that your sound devices are
hdmi:0,[3,7,8,9,10]
I'm not sure why the aplay -L isn't showing the same thing.

The alternative method should have found one of these as the correct
output in order to give you sound.  You then would have to somehow tell
pipewire to use that device.

 Online, I see that people are using pavucontrol with pipewire
 successfully.  If you can do that, it should be easy to fix this.
 Just go into pavucontrol and, while music is playing (even if there is
 no sound), set the default device to the each of the hdmi outputs in
 turn,
hdmi:0,3 hdmi:0,7 etc.
When one of them outputs sound, leave it as the default.  You then
don't have to worry about translating the alsa form into the pipewire
form; pavucontrol will have done it for you.
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