Hi, As the title suggests I've got a PB with a backlit keyboard. However over the last few days it has been doing the opposite. In a well lit room, the keyboard is backlit and the brightness is full. In a dark room, the keyboard backlight is off and screen brightness it low. I can adjust the screen brightness, but not the keyboard backlight when pressing wither F9 or F10. Any ideas of how to get it back to normal? Will i just need to cover the speakers/ censors and trick it into working in the right conditions? Thanks for any help.