Comment 12 for bug 917210

Hmm, sometimes even with the fix compiz wakes up around 50 Hz, all the while it's only needing to redraw the screen around 4-5 Hz. So there is another remaining source of unwanted wakeups not related to redrawing the screen.

Disabling the unityshell plugin solved the problem. It seems there is a 50Hz timer of some sort in Unity too, that is running when perhaps it doesn't need to be...