nvidia@nvidia-desktop:~$ cat /proc/asound/cards
 0 [HDA            ]: tegra-hda - NVIDIA Jetson AGX Xavier HDA
                      NVIDIA Jetson AGX Xavier HDA at 0x3518000 irq 55
nvidia@nvidia-desktop:~$ pacmd list-sinks
1 sink(s) available.
  * index: 12
        name: <alsa_output.platform-3510000.hda.hdmi-stereo-extra2>
        driver: <module-alsa-card.c>
        flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: SUSPENDED
        suspend cause: IDLE
        priority: 9000
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 65537
        muted: no
        current latency: 0.00 ms
        max request: 0 KiB
        max rewind: 0 KiB
        monitor source: 12
        sample spec: s16le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        used by: 0
        linked by: 0
        configured latency: 0.00 ms; range is 0.50 .. 371.52 ms
        card: 0 <alsa_card.platform-3510000.hda>
        module: 7
        properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "HDMI 0"
                alsa.id = "HDMI 0"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "8"
                alsa.card = "0"
                alsa.card_name = "NVIDIA Jetson AGX Xavier HDA"
                alsa.long_card_name = "NVIDIA Jetson AGX Xavier HDA at 0x3518000 irq 55"
                alsa.driver_name = "snd_hda_tegra"
                device.bus_path = "platform-3510000.hda"
                sysfs.path = "/devices/platform/3510000.hda/sound/card0"
                device.form_factor = "internal"
                device.string = "hdmi:0,2"
                device.buffering.buffer_size = "65536"
                device.buffering.fragment_size = "32768"
                device.access_mode = "mmap+timer"
                device.profile.name = "hdmi-stereo-extra2"
                device.profile.description = "Digital Stereo (HDMI 3)"
                device.description = "Built-in Audio Digital Stereo (HDMI 3)"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card"
        ports:
                hdmi-output-2: HDMI / DisplayPort 3 (priority 5700, latency offset 0 usec, available: yes)
                        properties:
                                device.icon_name = "video-display"
                                device.product.name = "DELL S2216H"
        active port: <hdmi-output-2>
nvidia@nvidia-desktop:~$ pacmd list-sources
1 source(s) available.
  * index: 12
        name: <alsa_output.platform-3510000.hda.hdmi-stereo-extra2.monitor>
        driver: <module-alsa-card.c>
        flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: SUSPENDED
        suspend cause: IDLE
        priority: 1000
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 65537
        muted: no
        current latency: 0.00 ms
        max rewind: 0 KiB
        sample spec: s16le 2ch 44100Hz
nvidia@nvidia-desktop:~$
                     Stereo
        used by: 0
        linked by: 0
        configured latency: 0.00 ms; range is 0.50 .. 371.52 ms
        monitor_of: 12
        card: 0 <alsa_card.platform-3510000.hda>
        module: 7
        properties:
                device.description = "Monitor of Built-in Audio Digital Stereo (HDMI 3)"
                device.class = "monitor"
                alsa.card = "0"
                alsa.card_name = "NVIDIA Jetson AGX Xavier HDA"
                alsa.long_card_name = "NVIDIA Jetson AGX Xavier HDA at 0x3518000 irq 55"
                alsa.driver_name = "snd_hda_tegra"
                device.bus_path = "platform-3510000.hda"
                sysfs.path = "/devices/platform/3510000.hda/sound/card0"
                device.form_factor = "internal"
                device.string = "0"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card"