Apple Cinema Display - half as bright as it should be

[skaman82]

Before opening the issue, have you...?

• Searched for existing issues
• Looked through the wiki
• Updated MonitorControl to the latest version (if applicable)

Describe the bug

My cinema display is about at 50% brightness on the max setting from the app on my M1 max MacBook (Ventura). I am only able to restore the full brightness by reconnecting the display to my old Mac pro and adjust it to correct brightness.

Steps to reproduce

See above

Expected behavior

Display should reach its max brightness when the app slider is set to 100%

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: Ventura 
- Mac model: Mac book pro (M1 max)
- MonitorControl version: latest release version 
- Monitor(s): Apple Cinema Display 27"
- Apple Silicon/M1 (yes or no): yes

[Draeconis]

Under Preferences > Displays, enable 'Show advanced settings'.

Under your LED Cinema Display entry ensure that Brightness control is enabled, and set DDC max to '1023'.

[waydabber]

Exactly!

[NickelPhillips]

I had/have a very similar experience: When I installed MonitorControl, I watched the display automatically dim to about 50% brightness. Everything on MonitorControl and on MacOS Ventura is still set to 100%. System Settings > Displays > Advanced offers no brightness control (see screenshot).

On an M1 Mac mini + Apple LED Cinema Display (27-inch). Installed MonitorControl.4.1.0.dmg

[NickelPhillips]

Preferences > Displays > Advanced and setting DDC max to 255 worked! Should've tried that before posting.

[waydabber]

Yes, the standard solution is to set it to 255 but it seems like hardware revisions and firmware might differ. For some the 255 value does not seem to work, there are varying reports about this.