Default sink name: alsa_output.pci-0000_09_00.1.hdmi-stereo
Default source name: alsa_input.pci-0000_00_14.2.analog-stereo

pulseaudio select hdmi as default sink

it is strange that pulseaudio select those unavailable hdmi port as
default sink


                device.vendor.name = "NVIDIA Corporation"
                device.product.id = "0beb"
                device.product.name = "GF104 High Definition Audio Controller"
                device.string = "1"
                device.description = "GF104 High Definition Audio Controller"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        profiles:
                output:hdmi-stereo: Digital Stereo (HDMI) Output (priority 
5400, available: unknown)
                output:hdmi-surround: Digital Surround 5.1 (HDMI) Output 
(priority 300, available: unknown)
                output:hdmi-stereo-extra1: Digital Stereo (HDMI) Output 
(priority 5200, available: unknown)
                output:hdmi-surround-extra1: Digital Surround 5.1 (HDMI) Output 
(priority 100, available: unknown)
                output:hdmi-stereo-extra2: Digital Stereo (HDMI) Output 
(priority 5200, available: unknown)
                output:hdmi-surround-extra2: Digital Surround 5.1 (HDMI) Output 
(priority 100, available: unknown)
                output:hdmi-stereo-extra3: Digital Stereo (HDMI) Output 
(priority 5200, available: unknown)
                output:hdmi-surround-extra3: Digital Surround 5.1 (HDMI) Output 
(priority 100, available: unknown)
                off: Off (priority 0, available: unknown)
        active profile: <output:hdmi-stereo>
        sinks:
                alsa_output.pci-0000_09_00.1.hdmi-stereo/#0: GF104 High 
Definition Audio Controller Digital Stereo (HDMI)
        sources:
                alsa_output.pci-0000_09_00.1.hdmi-stereo.monitor/#0: Monitor of 
GF104 High Definition Audio Controller Digital Stereo (HDMI)
        ports:
                hdmi-output-0: HDMI / DisplayPort (priority 5900, latency 
offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-1: HDMI / DisplayPort 2 (priority 5800, latency 
offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-2: HDMI / DisplayPort 3 (priority 5700, latency 
offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-3: HDMI / DisplayPort 4 (priority 5600, latency 
offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"


your motherboard have black jack for surround output

blue jack line in is for recording

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https://bugs.launchpad.net/bugs/1377697

Title:
  sound volume control doesn't work any more. [To be filled by O.E.M.,
  Realtek ALC898, Blue Line In, Rear] volume slider problem

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