Description of problem: Disabling the sound feedback option (when you change volume level), has no effects on the system Reproducible: Always Kmix 4.6RC1 KF 5.10
Downstream bugreport https://bugzilla.redhat.com/show_bug.cgi?id=1225917
Confirmed! Neither works for me. Plasma 5.8.5 Frameworks 5.28.0
I investigated a bit further. Everytime "volume feedback" is unchecked Kmix creates a new set of options in plasma-org.kde.plasma.desktop-appletsrc, like so: [Containments][6][Applets][9] immutability=1 plugin=org.kde.plasma.volume [Containments][6][Applets][9][Configuration][ConfigDialog] DialogHeight=540 DialogWidth=720 [Containments][6][Applets][9][Configuration][General] volumeFeedback=false Kmix obeys the option--but only for the current session. After restart of plasmashell "volume feedback" is always reenabled. If I disable it a new set of options (like those above) is created.
Works for me now. Plasma 5.10.2 KF 5.35.
In system settings you can now disable volume OSD under desktop behaviour