I’ve been using Firefox’s fullscreen mode on my Eee PC to get the maximum amount of vertical screen space possible. I noticed that the screen flickers black briefly whenever a tooltip or right click menu is displayed. All fullscreen applications seem to be affected.
This bug can be worked around by changing an advanced Compiz setting to turn off the unredirecting of fullscreen windows. Run this command in a terminal to turn the setting off, and fix the flickering: