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rkeating
Asked: 2019-10-22 15:56:35 +0800 CST

Kubuntu 19.10 screen saver activates HDMI sound and does not turn off screen

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I've installed Kubuntu 19.10 twice with the same results. When the screen energy savings timer is reached, the sound is switched from the motherboard sound (the sound source I've set to default) to HDMI sound and the screen does not turn off. I am using a Radeon 580 graphics card with the open source drivers.

What steps should I take next to trouble shoot this?

Edit: the screen actually does turn off and if you move the mouse within about 10 seconds, the screen turns on and the sound is still through the motherboard. If you do not move the mouse within about 10 seconds, the screen will turn on by itself and the sound will switch to the HDMI output.

kubuntu screensaver 19.10

1 Answers

  1. Best Answer

    Of all the things I tried, I finally found one that worked, disabling the module that corresponds to the HDMI sound. This removes the HDMI sound source.

    1. Find the module number of the HDMI sound source (the output lists the module as "index:")

    pacmd list-modules

    I found that mine was 7.

    1. To remove it do

    pacmd unload-module 7

    I put this in a script that runs at system startup. Now the screen saver and sound work (and continue to work) as expected.

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