Comment 5 for bug 323859

I think I have pinpointed the problem more clearly and more easily. On my end,
- I'm keeping the headphones plugged in at all times
- music is playing at all times during the test

To reproduce:
1- fn+4 (mute)
2- fn+4 (unmute)

This will have the effect of umuting the sound both from the headphones and the speakers. Is this the core issue, or is this a different issue? I could not reproduce using the original instructions of this bug report (it has nothing to do if an app was started before or after plugging the headphones, in my case)