Description of problem:
Thunderbird is not able to play the sound ( wave/ogg/mp3 ) when a message arrives.
With F20 it worked everytime, statring with F21 it worked spradically and atm, it does not work at all anymore.
I'm monitoring the try to play a sound with PA-controls, but no device is opened for thunderbird nor does Thunderbird log anything to the console.
from my pov, thunderbird does not even try to play it.
Version-Release number of selected component (if applicable):
Preferences -> General -> try to play the sound notification
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Thunderbird uses the system notification sound channel, instead his PA channel own.