HDMI audio dies when the screen goes to sleep

[Spectrum]

Hi! I have a problem with HDMI. I do this:

1. Connect my Kubuntu laptop to a TV using HDMI.
2. Under System Settings -> Multimedia, HDMI audio now exists as an option. Select that one.
3. HDMI video and audio now plays correctly on the TV.
4. Let the screen go to sleep (which it does after a minute or two, as configured under System Settings -> Power Management).
5. Wake the screen back up.
6. HDMI audio is now dead. When I go back to System Settings -> Multimedia, HDMI is not available as an option.

Disconnecting and reconnecting the HDMI cable does not fix this.
Logging out of KDE and logging back in fixes it.

I have two questions:

A: This clearly looks like a bug. Where should I report it? Which component should be responsible for this?
B: Logging out fixes it, presumably because it restarts some process. Does anyone know which process that might be? Can I restart it manually without having to log out?

Thanks in advance!

My laptop is a HP 250 G6 Notebook PC.

It might be related to this other HDMI problem I am having: https://www.kubuntuforums.net/showth...e-disconnected

[MDuff]

This is a matter of changing configuration settings. Here is a short "How-To" I made up for someone I helped locally with what sounds like the same problem:
This was using Mint KDE 18.3 Kubuntu may be slightly different.

To play audio from laptop through HDMI cable to TV speakers
Connect HDMI cable between Laptop and Computer

On Laptop System Tray (right side of desktop panel)
1. Right click on Audio volume symbol
2. Left click on "Audio Volume Settings" to display Audio Volume settings window
3. Left Click "Audio Volume" in Left Panel
4. Left Click [Configuration] Tab
5. Upper "Built-in Audio Profile" should be "Digital Stereo (HDMI) Output)
6. Lower "Built-in Audio Profile" should be "Off" to play through HDMI to TV

When HDMI cable to TV is disconnected:
To play audio through Computer speakers again:
Return to settings as above Step 6 - Lower "Built-in Audio Profile" and
change to "Analogue Stereo Output".

Be sure to click [OK] at bottom right of settings window or setting changes will not be saved.
If the [OK] [Cancel] buttons are hidden off screen hold down the [Alt] key , click, hold and drag the window until [OK] is visible.

[Spectrum]

This is a matter of changing configuration settings. Here is a short "How-To" I made up for someone I helped locally with what sounds like the same problem:
This was using Mint KDE 18.3 Kubuntu may be slightly different.

To play audio from laptop through HDMI cable to TV speakers
Connect HDMI cable between Laptop and Computer

On Laptop System Tray (right side of desktop panel)
1. Right click on Audio volume symbol
2. Left click on "Audio Volume Settings" to display Audio Volume settings window
3. Left Click "Audio Volume" in Left Panel
4. Left Click [Configuration] Tab
5. Upper "Built-in Audio Profile" should be "Digital Stereo (HDMI) Output)
6. Lower "Built-in Audio Profile" should be "Off" to play through HDMI to TV

When HDMI cable to TV is disconnected:
To play audio through Computer speakers again:
Return to settings as above Step 6 - Lower "Built-in Audio Profile" and
change to "Analogue Stereo Output".

Be sure to click [OK] at bottom right of settings window or setting changes will not be saved.
If the [OK] [Cancel] buttons are hidden off screen hold down the [Alt] key , click, hold and drag the window until [OK] is visible.

Yes! You are right. This works. Thanks a lot for the help, man!

[Spectrum]

I have one more question: Do you know how to do this from the command line?

[MDuff]

Happy I could help.
Cheers