Hello. I have a MBP 2010 17". At home, I connect it to an external monitor. For the past few days, I left the machine on to backup the data. Before I went to bed, I pressed F1 several times to dim the LCD screen to a complete dark. Then, I went to bed. Few minutes later, the LCD screen was brightened by itself (really scary). This has happened several times already. Anybody knows what happened and how to fix this?