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leoluzacmp Author

Level 1

40 points

Led Cinema Display brightness control not working after upgraded to macOS Monterey

My setup is a Mac mini M1 connected to a 27" Led Cinema Display via USB-C adapter for mini displayport. Working perfectly with MacOs Big Sur since always. But when I upgrade to Monterey, the monitor's brightness come locked at 50%, and brightness commands disappeared in System Preferences. Brightness keys on Apple Keyboard don't work either (f1, f2, f14, f15) I've tried apps like MonitorControl, but they only serve to decrease brightness ... the maximum brightness in these applications starts from 50% that the monitor is stuck. Anyone else having this problem? What can I do?

Mac mini, macOS 12.0

Posted on Oct 29, 2021 11:15 AM

Top-ranking reply

nguyendk

Level 1

15 points

Posted on Aug 11, 2022 1:32 PM

First off, thanks to everyone on the board.

My setup - Mac Mini M1, Thunderbolt Display off USB-C, LED Cinema Display off HDMI

Installed Monitor Control on Mac Mini M1 running Monterey and adjusted the DDC Max to 255. Brightness level still stuck at 50%.

Installed Monitor Control on a MacBook Pro running Catalina, connected Cinema Display, and adjusted the DDC Max to 255.

And voila, was able to get brightness to 100% in this environment (Macbook Pro / Catalina / DDC Max 255)

Afterwards, I disconnected the Cinema Display and connected it back into the Mac Mini M1 setup. Bam 100% brightness. The brightness level was maintained from where I had it prior to unplugging from Macbook Pro.

Hope this helps someone.

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Led Cinema Display brightness control not working after upgraded to macOS Monterey

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