Comment 2 for bug 720679

A small note, the linked branch fixes the problem in the case where compiz starts up after the root window is set, but you won't be able to change it while compiz is running because there isn't any reliable way to get a notification when a background pixmap for a window changes (XDamage will report changes to the root window every time a subwindow changes which kills performance, Expose events wont be generated because all subwindows have been redirected)