ok, after setting it post-reboot, I see the following setting it as the
default in the logs:

4572:I: [pulseaudio] core.c: default_sink: alsa_output.pci-
0000_00_1b.0.iec958-stereo -> alsa_output.pci-0000_01_00.1.hdmi-surround

as well as the following active ports with `pactl list`:

        Ports:
                hdmi-output-0: HDMI / DisplayPort (priority: 5900, latency 
offset: 0 usec, available)
                        Properties:
                                device.icon_name = "video-display"
                                device.product.name = "HTR-5063
    "
                        Part of profile(s): output:hdmi-stereo, 
output:hdmi-surround, output:hdmi-surround71
                hdmi-output-1: HDMI / DisplayPort 2 (priority: 5800, latency 
offset: 0 usec, available)
                        Properties:
                                device.icon_name = "video-display"
                                device.product.name = "LG Ultra HD
 "
                        Part of profile(s): output:hdmi-stereo-extra1, 
output:hdmi-surround-extra1, output:hdmi-surround71-extra1
                hdmi-output-2: HDMI / DisplayPort 3 (priority: 5700, latency 
offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "video-display"
                        Part of profile(s): output:hdmi-stereo-extra2, 
output:hdmi-surround-extra2, output:hdmi-surround71-extra2
                hdmi-output-3: HDMI / DisplayPort 4 (priority: 5600, latency 
offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "video-display"
                        Part of profile(s): output:hdmi-stereo-extra3, 
output:hdmi-surround-extra3, output:hdmi-surround71-extra3

I put the machine to sleep for 30s, then wake it, and I see:

4824:I: [pulseaudio] core.c: default_sink: alsa_output.pci-0000_01_00.1
.hdmi-surround -> alsa_output.pci-0000_00_1b.0.iec958-stereo

looking in the logs around that time, there's a bunch of errors about
the hdmi audio devices, and interestingly, `pactl list` shows my output
devices switching ports, even though that doesn't make sense:

        Ports:
                hdmi-output-0: HDMI / DisplayPort (priority: 5900, latency 
offset: 0 usec, available)
                        Properties:
                                device.icon_name = "video-display"
                                device.product.name = "LG Ultra HD
 "
                        Part of profile(s): output:hdmi-stereo, 
output:hdmi-surround, output:hdmi-surround71
                hdmi-output-1: HDMI / DisplayPort 2 (priority: 5800, latency 
offset: 0 usec, available)
                        Properties:
                                device.icon_name = "video-display"
                                device.product.name = "HTR-5063
    "
                        Part of profile(s): output:hdmi-stereo-extra1, 
output:hdmi-surround-extra1, output:hdmi-surround71-extra1
                hdmi-output-2: HDMI / DisplayPort 3 (priority: 5700, latency 
offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "video-display"
                        Part of profile(s): output:hdmi-stereo-extra2, 
output:hdmi-surround-extra2, output:hdmi-surround71-extra2
                hdmi-output-3: HDMI / DisplayPort 4 (priority: 5600, latency 
offset: 0 usec, not available)
                        Properties:
                                device.icon_name = "video-display"
                        Part of profile(s): output:hdmi-stereo-extra3, 
output:hdmi-surround-extra3, output:hdmi-surround71-extra3

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https://bugs.launchpad.net/bugs/1888598

Title:
  pulseaudio has is buggy with hdmi audio and sleep/wake

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