When watching a video in a web browser Ubuntu starts to fade out the screen and eventually goes to black after 2 minutes. I expect this because this is how I have my power settings set up. When I watch a movie in the video player the screen does not fade out. So it seems the system doesn't realize there is something running when a video is playing in the browser. Is there a way to fix this without making the power settings to always on? Ubuntu 13.04