Outputs of pacmd list-sinks before and after suspend:

======================================= before
==============================================

2 sink(s) available.
  * index: 0
        name: <alsa_output.pci-0000_01_00.1.hdmi-stereo>
        driver: <module-alsa-card.c>
        flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: IDLE
        suspend cause: (none)
        priority: 9030
        volume: front-left: 52739 /  80% / -5,66 dB,   front-right: 52739 /  
80% / -5,66 dB
                balance 0,00
        base volume: 65536 / 100% / 0,00 dB
        volume steps: 65537
        muted: no
        current latency: 301,48 ms
        max request: 64 KiB
        max rewind: 64 KiB
        monitor source: 0
        sample spec: s16le ch 2 44100 Hz
        channel map: front-left,front-right
                     Stereo
        used by: 0
        linked by: 0
        configured latency: 371,52 ms; range is 0,50 .. 371,52 ms
        card: 0 <alsa_card.pci-0000_01_00.1>
        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 = "3"
                alsa.card = "0"
                alsa.card_name = "HDA NVidia"
                alsa.long_card_name = "HDA NVidia at 0xf7080000 irq 73"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:01:00.1"
                sysfs.path = 
"/devices/pci0000:00/0000:00:01.1/0000:01:00.1/sound/card0"
                device.bus = "pci"
                device.vendor.id = "10de"
                device.vendor.name = "NVIDIA Corporation"
                device.product.id = "0fb9"
                device.product.name = "GP107GL High Definition Audio Controller"
                device.string = "hdmi:0"
                device.buffering.buffer_size = "65536"
                device.buffering.fragment_size = "32768"
                device.access_mode = "mmap+timer"
                device.profile.name = "hdmi-stereo"
                device.profile.description = "Digital Stereo (HDMI)"
                device.description = "GP107GL High Definition Audio Controller 
Digital Stereo (HDMI)"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        ports:
                hdmi-output-0: HDMI / DisplayPort (priority 5900, latency 
offset 0 usec, available: yes)
                        properties:
                                device.icon_name = "video-display"
                                device.product.name = "U28E590
     "
        active port: <hdmi-output-0>
    index: 1
        name: <alsa_output.pci-0000_05_00.6.analog-stereo>
        driver: <module-alsa-card.c>
        flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY 
        state: IDLE
        suspend cause: (none)
        priority: 9039
        volume: front-left: 21819 /  33% / -28,66 dB,   front-right: 21819 /  
33% / -28,66 dB
                balance 0,00
        base volume: 65536 / 100% / 0,00 dB
        volume steps: 65537
        muted: no
        current latency: 101,09 ms
        max request: 17 KiB
        max rewind: 17 KiB
        monitor source: 1
        sample spec: s16le ch 2 44100 Hz
        channel map: front-left,front-right
                     Stereo
        used by: 0
        linked by: 0
        fixed latency: 100,14 ms
        card: 1 <alsa_card.pci-0000_05_00.6>
        module: 8
        properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "ALC233 Analog"
                alsa.id = "ALC233 Analog"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "1"
                alsa.card_name = "HD-Audio Generic"
                alsa.long_card_name = "HD-Audio Generic at 0xf7580000 irq 75"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:05:00.6"
                sysfs.path = 
"/devices/pci0000:00/0000:00:08.1/0000:05:00.6/sound/card1"
                device.bus = "pci"
                device.vendor.id = "1022"
                device.vendor.name = "Advanced Micro Devices, Inc. [AMD]"
                device.product.id = "15e3"
                device.product.name = "Family 17h (Models 10h-1fh) HD Audio 
Controller"
                device.string = "front:1"
                device.buffering.buffer_size = "17664"
                device.buffering.fragment_size = "2944"
                device.access_mode = "mmap"
                device.profile.name = "analog-stereo"
                device.profile.description = "Stereo analogico"
                device.description = "Family 17h (Models 10h-1fh) HD Audio 
Controller Stereo analogico"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        ports:
                analog-output-speaker: Altoparlanti (priority 10000, latency 
offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-speakers"
                analog-output-headphones: Cuffie analogiche (priority 9900, 
latency offset 0 usec, available: yes)
                        properties:
                                device.icon_name = "audio-headphones"
        active port: <analog-output-headphones>

======================================= after
==============================================

1 sink(s) available.
  * index: 3
        name: <alsa_output.pci-0000_01_00.1.hdmi-stereo>
        driver: <module-alsa-card.c>
        flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: IDLE
        suspend cause: (none)
        priority: 9030
        volume: front-left: 52739 /  80% / -5,66 dB,   front-right: 52739 /  
80% / -5,66 dB
                balance 0,00
        base volume: 65536 / 100% / 0,00 dB
        volume steps: 65537
        muted: no
        current latency: 341,01 ms
        max request: 64 KiB
        max rewind: 64 KiB
        monitor source: 4
        sample spec: s16le ch 2 48000 Hz
        channel map: front-left,front-right
                     Stereo
        used by: 0
        linked by: 0
        configured latency: 341,33 ms; range is 0,50 .. 341,33 ms
        card: 0 <alsa_card.pci-0000_01_00.1>
        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 = "3"
                alsa.card = "0"
                alsa.card_name = "HDA NVidia"
                alsa.long_card_name = "HDA NVidia at 0xf7080000 irq 73"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:01:00.1"
                sysfs.path = 
"/devices/pci0000:00/0000:00:01.1/0000:01:00.1/sound/card0"
                device.bus = "pci"
                device.vendor.id = "10de"
                device.vendor.name = "NVIDIA Corporation"
                device.product.id = "0fb9"
                device.product.name = "GP107GL High Definition Audio Controller"
                device.string = "hdmi:0"
                device.buffering.buffer_size = "65536"
                device.buffering.fragment_size = "32768"
                device.access_mode = "mmap+timer"
                device.profile.name = "hdmi-stereo"
                device.profile.description = "Digital Stereo (HDMI)"
                device.description = "GP107GL High Definition Audio Controller 
Digital Stereo (HDMI)"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        ports:
                hdmi-output-0: HDMI / DisplayPort (priority 5900, latency 
offset 0 usec, available: yes)
                        properties:
                                device.icon_name = "video-display"
                                device.product.name = "U28E590
     "
        active port: <hdmi-output-0>

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https://bugs.launchpad.net/bugs/1883673

Title:
  no sound after resume

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