Why is the connected HDMI receiver not detected by PulseAudio?

Question

After connecting my GTX 980 Ti to my Onkyo TX-NR509 receiver via HDMI I have the following situation:

• nvidia-settings lists HDMI-0 as connected and even shows the name of the receiver.
• pavucontrol lists GM200 High Definition Audio (so it's not this common issue) but all the profiles are listed as "unplugged" and "unavailable".
• The receiver says "No Signal".

How do I convince PulseAudio that the receiver is connected?

Answer 1

I had to enable the receiver as a "screen" in nvidia-settings:

1. Run sudo nvidia-settings
2. Go to X Server Display Configuration
3. Select the receiver
4. Change the configuration to X screen 0
5. Set the position and size to the same as another screen
6. Apply and save the X configuration file