Comment 3 for bug 322250

This is quite an annoying bug because it reduces battery life.
It doesn't happen with Banshee or Skype for example.
Even if the culprit is likely the adobe flash plugin I think it should be worked around because a lot of people uses it every day.

To reproduce this bug start the powertop tool, play a video on youtube with firefox, then close that tab. You'll see that huge amount of wakeups from pulseaudio.