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OS X El Capitan automatically raises brightness on iMac's built-in display


Well-known member
Sep 4, 2014
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Has anyone else noticed the brightness of the iMac's built-in display slowly but surely increasing on its own since updating to El Capitan?

It's very subtle. Sometimes it takes a few days for me to notice that the brightness has increased. I'm not sure if it's only happening once per boot-up or during actual use.

Well? usually it's "slowly but surely," but earlier today the brightness went all the way up to the max setting. Last time I used the iMac it was about two-thirds of the way to the max setting.

I have a Late 2009 iMac.

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