I have a Dell Studio 1747 with Ubuntu 12.04 and whenever I hit the F6 key to change the keyboards backlight brightness some strange stuff happens with unity. Some mouse input such as clicking on the launch bar or the cog at the top right no longer works. The desktop becomes completely unresponsive (I can't click on shortcuts or any launchers I have on the desktop.) If I have any windows open, I can move them, but I can't type into anything. I usually have to restart at this point.
Has anyone had this issue before and does anyone know a way to fix it?