Comment # 6 on bug 1121809 from Pace Freeman

Hi, 

I found this issue and thought I would add some additional info.

I have a Lenovo Thinkstation P330, running Tumbleweed, it has both integrated
sound and graphics and an NVIDIA Quadro P400 card.

Previous to running Tumbleweed I ran Debian, Fedora and POP!_OS, all of these
allowed me to pass audio through the display port of the NVIDIA card, to my
screen. Under Tumbleweed this does not work however.

It looks like the NDIVIA pass-through is not seen at all.

cat /proc/asound/cards
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xb4230000 irq 142
 1 [C920           ]: USB-Audio - HD Pro Webcam C920
                      HD Pro Webcam C920 at usb-0000:00:14.0-7.2, high speed


The following document in section 10.3 talks about the under emulation of
logical devices, I'm wondering if this could be related to the issue as I don't
see the NVIDIA sound device at all.

https://download.nvidia.com/XFree86/gpu-hdmi-audio-document/#issues_in_alsa


 aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
speexrate
    Rate Converter Plugin Using Speex Resampler
pipewire
    PipeWire Sound Server
pulse
    PulseAudio Sound Server
upmix
    Plugin for channel upmix (4,6,8)
default
    Default ALSA Output (currently PulseAudio Sound Server)
sysdefault:CARD=PCH
    HDA Intel PCH, ALC233 Analog
    Default Audio Device
front:CARD=PCH,DEV=0
    HDA Intel PCH, ALC233 Analog
    Front speakers
surround21:CARD=PCH,DEV=0
    HDA Intel PCH, ALC233 Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=PCH,DEV=0
    HDA Intel PCH, ALC233 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
    HDA Intel PCH, ALC233 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
    HDA Intel PCH, ALC233 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
    HDA Intel PCH, ALC233 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
    HDA Intel PCH, ALC233 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
hdmi:CARD=PCH,DEV=0
    HDA Intel PCH, HDMI 0
    HDMI Audio Output
hdmi:CARD=PCH,DEV=1
    HDA Intel PCH, HDMI 1
    HDMI Audio Output
hdmi:CARD=PCH,DEV=2
    HDA Intel PCH, HDMI 2
    HDMI Audio Output
hdmi:CARD=PCH,DEV=3
    HDA Intel PCH, HDMI 3
    HDMI Audio Output
hdmi:CARD=PCH,DEV=4
    HDA Intel PCH, HDMI 4
    HDMI Audio Output