When problems with backlights occur, there are several things you can try to address the issue, which may be rooted either in a fault with the hardware or with the operating system. Have you seen this happen or heard about it? The backlight indicator appears when using the function keys to adjust the keyboard backlight level. I have messed with it all and won't budge to adjust (unless I use the function keys). Now I know there's F5 and F6 to adjust brightness but as well as the "automatically adjust" setting in Settings/Keyboard.
Recently MacFixIt reader David wrote in with such an issue: I picked up a new MacBook Pro 13.3" and noticed this almost immediately at work the next day.the backlit keyboard was on full blast. When you press the F5 or F6 buttons on the keyboard, the system should show a semitransparent backlight level indicator at the bottom of the screen, but if you have auto backlight adjustments enabled, then the system will not show any level indicator and just brighten or dim the backlight as is necessary however, in some instances these options may not work as expected. To adjust the illumination you can either press the function keys on the keyboard (usually the F5 and F6 keys) or enable automatic adjustments however, there may be times when these adjustments do not work properly. A number of Apple's portable systems come with a backlight that illuminates the keyboard for easy viewing in dark environments.
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