Why does MacBook display brightness keep going to the lowest brightness?

Hi! My daughter's MacBook (10,4.11)runs perfectly...except for one problem, the display brightness won't stay on the brightest setting. Every time the computer restarts the brightness goes to the lowest setting, which is too dim. We turn it up, it's fine until she does a restart. Any ideas? Thanks, Bill

I'm having a similar problem, when I wake my macbook or sometimes when I turn it on, the display is on full brightness even after I've set it to my liking. I'm having to reset the brightness on my macbook all the time because the full brightness is so bright it gives me a headache. I was just trying to figure out if there is a way for me the set my desired brightness once and not have to do it every time I turn the computer on.

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