Comment 2 for bug 90341

As a drawing is worth a thousand words, I have attached here a screenshot (actually an assembly of several screenshots) showing before and after the suspend/resume events with a small snapshot of the power history of the Gnome Power Manager.
You shall notice that eventhough in the "after state" the sound is displayed as mute, it is not. So it is only a "display bug", the system works as expected.