Public bug reported:

I have a NVidia video card with a monitor and an onboard card that I use
for audio only. This worked fine before upgrading to Kubuntu 18.04. Now
to get sound working on the onboard hdmi port I need to enable a monitor
on the port in settings [System Settings > Display and Monitor >
Displays ] (which is useless because the video from that card is not
used). And then when the monitor [NVidia and so the onboard enabled as
well] goes to standby the sound stops as well. I need the sound to play
without the enabled monitor and to have it continue to play even when
the monitor goes to standby.


$ uname -a
Linux desktop 4.15.0-33-generic #36-Ubuntu SMP Wed Aug 15 16:00:05 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic

$ cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version k4.15.0-33-generic.

$ pulseaudio --version
pulseaudio 11.1

$ plasmashell --version
plasmashell 5.12.6

$ kf5-config --version
Qt: 5.9.5
KDE Frameworks: 5.44.0
kf5-config: 1.0

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1791060

Title:
  No HDMI sound without Video enabled

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