MacBook Pro aA1398 no brightness control on Big Sur

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  • ACS-Repair
    Badcaps Veteran
    • Feb 2021
    • 204
    • Canada
    #1

    MacBook Pro aA1398 no brightness control on Big Sur

    I having an issue where in Big Sur, the screen brightness doesn't work on the F2/F3 keys or in the display preferences of my mid 2014 A1398. If I boot from a High Sierra flash drive, it works fine. I've seen others commenting on this on the internet as well. It seems that if you have Big Sur 11.2.3 or lower it works. Anything higher there is no control.
    It seems like the display panel itself may have been dropped from Apple's support list. While the part number appears to be valid, I don't have a history on this computer. Just curious if anyone else has come across this.
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