Hi, I have a Fujitsu Lifebook series A, 64 bit with ATI Radeon graphics. It is installed with Ubuntu 14.10. The screen dims and then returns to normal but I have to wait till it returns to normal in order to proceed. If I watch a movie like 8moivesx it doesn't do it but most of the time it does like Ebay, Craigslist, New Apps, etc. Is there any way to correct this issue?