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manual screen brightness control on a 21.5 2012 iMac running Catalina 10.15.7

Can anyone tell me how to adjust the screen brightness on a 21.5 2012 iMac running Catalina 10.15.7

iMac 21.5″, macOS 10.15

Posted on Dec 4, 2020 11:01 PM

Reply
2 replies

Dec 5, 2020 2:07 AM in response to Malcolm J. Rayfield

Hi Malcolm,

the F1 & F2 keys were not responding on my keyboard. The screen brightness adjustment slider was not present in the display dialog box.

I contacted Apple support and spoke to a consultant who suggested that I disconnect all my peripherals and power for a minute and then restart holding down the Option + Command + R + P keys.

When the iMac started up all was well. The F1 & F2 keys were responding and the brightness slider reappeared in the display dialog box.

An added bonus was that my Mac is running faster.

Thanks for your help.

manual screen brightness control on a 21.5 2012 iMac running Catalina 10.15.7

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