Re #13: I removed the fglrx driver installed by Ubuntu and replaced it with the 11.8 Catalyst driver directly from AMD. The watermark disappeared and also it seems that some of the garbage I occasionally got when running a rotated display are now gone.
Re #13: I removed the fglrx driver installed by Ubuntu and replaced it with the 11.8 Catalyst driver directly from AMD. The watermark disappeared and also it seems that some of the garbage I occasionally got when running a rotated display are now gone.