[SOLVED] How does one turn down (or off) notification sounds

[Scorpa54]

I have gone through System settings > Sound and under notification sounds have move the bar to 30% and when I reopen the system settings > sound panel again the bar has reverted back to 100%. There is no apply button. I have tried to set the bar to 0% with the same results and I have clicked the speaker icon that when hovered over claims it is a mute and that doesn't work either. I really don't need something telling me that I have just clicked a button.

[Snowhog]

Are you using Plasma (Wayland) or Plasma (X11) when you log in?

[Schwarzer Kater]

Using -> System Settings -> Sound (section: Input & Output) does not work for me either (this seems to be a bug…), but you can disable (most) sounds in

-> System Settings -> Colours & Themes (section: Appearance & Style) -> System Sounds.
There one can disable notification sounds in the top right corner and -> click [Apply].

[Scorpa54]

Using -> System Settings -> Sound (section: Input & Output) does not work for me either (this seems to be a bug…), but you can disable (most) sounds in

-> System Settings -> Colours & Themes (section: Appearance & Style) -> System Sounds.
There one can disable notification sounds in the top right corner and -> click [Apply].

Thank you kindly

[Schwarzer Kater]

Addition

Just re-tested this for Wayland:

Altering/Disabling Notification Sounds in -> System Settings -> Sound (section: Input & Output) -> Playback Streams does not work both in X11 and Wayland (KDE Plasma 6.6.5).
It always reverts back to/stays at 100%.

[RazorShark]

The notification volume not saving is a bug, although I'm not sure if it can be attributed to KDE or Pipewire. I fixed it by running the following commands in a terminal:

systemctl --user stop wireplumber

rm ~/.local/state/wireplumber/*

systemctl --user start wireplumber

Feel free to check the contents of that wireplumer directory. I think the important file to remove is the stream-properties file since that contains the actual notification volume state, so you can only remove that if you want to play it safe. But once you restart wireplumber the notification volume will now stick when you close and reopen the Sound settings panel.

[Schwarzer Kater]

RazorShark : Thank you for sharing your findings!

Addition to the addition

Altering/Disabling Notification Sounds in -> System Settings -> Sound (section: Input & Output) -> Playback Streams does not work both in X11 and Wayland (KDE Plasma 6.6.5).
It always reverts back to/stays at 100%.

rm $HOME/.local/state/wireplumber/stream-properties
followed by
systemctl --user restart wireplumber.service
in the Konsole terminal emulator
did fix it for me in Plasma 6.6.5 (from the Kubuntu Backports).

Fun fact: by this it was also automatically fixed for all additional users on the systems…


--> The bug did not occur at all in my Kubuntu 26.04 LTS installations with the default Plasma 6.6.4 - can anybody confirm that it is a 6.6.5 bug only?