(cross-posting here with the hope that someone will have an answer... https://www.kubuntuforums.net/showthrea ... management)

I have a few pinned tabs in my Firefox that produce notifications. A chime is played every time there is a notification... firefox shows the little speaker icon on the tab when this happens. However, this is a very short chime that lasts for may be just a couple of seconds. The little speaker icon disappears from the tab indicating that there is no longer any sound being played by that tab.
However, KDE seems to think that the sound has never stopped and suppresses power management. Does anyone see a similar behavior? Is there a fix to it?