[GH-ISSUE #1433] DDC enabled for only one Monitor in Daisy chain #812

New issue

Closed

opened 2026-05-05 06:44:20 -06:00 by gitea-mirror · 3 comments

gitea-mirror commented

2026-05-05 06:44:20 -06:00

Owner

Originally created by @desek90 on GitHub (Sep 17, 2023).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1433

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

Hello,
I'm using the newest version of MonitorControl (v.4.2.0) with my setup consisting of a M2 MacBook Pro 14" and two LG 24MD4KL driven in Daisy Chain. I have an issue that only for one of the monitors the DDC is enabled.
Is this a desired behavior?

Best Regards,
Bart
MonitorControl

Steps to reproduce

Connect the Monotors in daisy chain with Thunderbolt 4 cables. Macbook is not open.

Expected behavior

I would expect the DDC control to be enabled for both displays

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: 13.5.2
- Mac model: MacBook Pro 14" 2023 with M2 Pro
- MonitorControl version: 4.2.0
- Monitor(s): Two 24MD4KL
- Apple Silicon/M1 (yes or no): yes

Originally created by @desek90 on GitHub (Sep 17, 2023). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1433 ### Before opening the issue, have you...? - [X] Searched for existing issues - [X] Looked through [the wiki](https://github.com/MonitorControl/MonitorControl/wiki) - [X] Updated MonitorControl to the latest version (if applicable) ### Describe the bug Hello, I'm using the newest version of MonitorControl (v.4.2.0) with my setup consisting of a M2 MacBook Pro 14" and two LG 24MD4KL driven in Daisy Chain. I have an issue that only for one of the monitors the DDC is enabled. Is this a desired behavior? Best Regards, Bart <img width="842" alt="MonitorControl" src="https://github.com/MonitorControl/MonitorControl/assets/81962520/3701a441-8d22-4a5a-8ba9-6359ba824fee"> ### Steps to reproduce Connect the Monotors in daisy chain with Thunderbolt 4 cables. Macbook is not open. ### Expected behavior I would expect the DDC control to be enabled for both displays ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: 13.5.2 - Mac model: MacBook Pro 14" 2023 with M2 Pro - MonitorControl version: 4.2.0 - Monitor(s): Two 24MD4KL - Apple Silicon/M1 (yes or no): yes ```

gitea-mirror closed this issue

2026-05-05 06:44:21 -06:00

gitea-mirror commented

2026-05-05 06:44:25 -06:00

Author

Owner

@waydabber commented on GitHub (Sep 20, 2023):

The 24MD4KL should support native brightness control. Actually for this display MC should not be needed at all. It seems like only the first member of the daisy chain works however. Without MC can you control brightness?

@waydabber commented on GitHub (Sep 20, 2023): The 24MD4KL should support native brightness control. Actually for this display MC should not be needed at all. It seems like only the first member of the daisy chain works however. Without MC can you control brightness?

gitea-mirror commented

2026-05-05 06:44:27 -06:00

Author

Owner

@desek90 commented on GitHub (Sep 23, 2023):

Hello,

yes, without MC I can also control the brightness. I just thought, that thanks to DDC I can make some extended settings, that's why I tried to find out why it only works for one display.
Yesterday I found out, that if I reconnect the display at the end of the Daisy Chain, the DDC option appears for both. If I reconnect the whole daisy chain, the DDC is again unavailable on the second screen.

@desek90 commented on GitHub (Sep 23, 2023): Hello, yes, without MC I can also control the brightness. I just thought, that thanks to DDC I can make some extended settings, that's why I tried to find out why it only works for one display. Yesterday I found out, that if I reconnect the display at the end of the Daisy Chain, the DDC option appears for both. If I reconnect the whole daisy chain, the DDC is again unavailable on the second screen.

gitea-mirror commented

2026-05-05 06:44:29 -06:00

Author

Owner

@waydabber commented on GitHub (Oct 18, 2023):

In BetterDisplay you can set a display to be treated as a "third party display" so force-enable DDC. This feature is not planned in MonitorControl however as the current feature set is now considered final by the team.

@waydabber commented on GitHub (Oct 18, 2023): In [BetterDisplay](https://betterdisplay.pro) you can set a display to be treated as a "third party display" so force-enable DDC. This feature is not planned in MonitorControl however as the current feature set is now considered final by the team.