1358 Views 3 Replies Latest reply: Mar 16, 2009 5:02 PM by neuroanatomist
The ability to adjust the keyboard backlight depends on the amount of ambient light hitting the light sensor. If you're in a bright room during the day with plenty of windows, the keyboard backlight keys won't work. If you cover up the light sensor next to the iSight camera with your hand, the keyboard backlight keys will work. This is just the way the computer is designed right now...
I had the same problem and took the laptop into a dark closet and dimmed the display down to the lowest level above complete black. No keyboard backlight. There are a number of posts on the web at MacRumors and other sites that also talk about this problem.
I get the same issue, the "no" indicator when using the function keys to try and get the backlight to work. So, I downloaded Lab Tick which allows me to at least get the backlight working but the function keys do nothing and the ambient sensor doesn't do anything at all.
Looks like it's time to go to the Apple Store and get them to fix it since it's still under warranty.