[GH-ISSUE #1831] DDC control laggy or unresponsive on Tahoe #1005

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opened 2026-05-05 07:01:22 -06:00 by gitea-mirror · 2 comments

gitea-mirror commented

2026-05-05 07:01:22 -06:00

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Originally created by @VishalDhayalan on GitHub (Jan 18, 2026).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1831

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

I have Monitor Control v4.3.3 installed on both, an M4 Macbook pro running Sequoia and an M4 macbook pro running Tahoe. On Tahoe the same 2 external monitors either don't respond at all to brightness and contrast changes or respond after a good 10-20s.

Steps to reproduce

Connect monitors to macbook running Tahoe (in this case Tahoe 26.0.1)
Change brightness or contract either via sliders or keyboard

Expected behavior

Brightness and contrast changes happen in real-time in a continuous manner

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: Tahoe 26.0.1
- Mac model: M4 Pro MacBook Pro
- MonitorControl version: 4.3.3
- Monitor(s): Philips 24E1N1300AE and Dell P2723DE
- Apple Silicon/M1 (yes or no): yes

Originally created by @VishalDhayalan on GitHub (Jan 18, 2026). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1831 ### 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 I have Monitor Control v4.3.3 installed on both, an M4 Macbook pro running Sequoia and an M4 macbook pro running Tahoe. On Tahoe the same 2 external monitors either don't respond at all to brightness and contrast changes or respond after a good 10-20s. ### Steps to reproduce 1. Connect monitors to macbook running Tahoe (in this case Tahoe 26.0.1) 2. Change brightness or contract either via sliders or keyboard ### Expected behavior Brightness and contrast changes happen in real-time in a continuous manner ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: Tahoe 26.0.1 - Mac model: M4 Pro MacBook Pro - MonitorControl version: 4.3.3 - Monitor(s): Philips 24E1N1300AE and Dell P2723DE - Apple Silicon/M1 (yes or no): yes ```

gitea-mirror added the

feedback needed from reporter

label 2026-05-05 07:01:22 -06:00

gitea-mirror commented

2026-05-05 07:01:25 -06:00

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@waydabber commented on GitHub (Feb 9, 2026):

How the displays are connected?

Can you try BetterDisplay and report back if you experience the same? It has a different DDC implementation, and it would be great to compare if this issue happens with that app as well.

But: M4/M5 should support DDC fine both with HDMI and DP, there are no reports about issues.

@waydabber commented on GitHub (Feb 9, 2026): How the displays are connected? Can you try [BetterDisplay](https://betterdisplay.pro) and report back if you experience the same? It has a different DDC implementation, and it would be great to compare if this issue happens with that app as well. But: M4/M5 should support DDC fine both with HDMI and DP, there are no reports about issues.

gitea-mirror commented

2026-05-05 07:01:27 -06:00

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@vocky8 commented on GitHub (Mar 5, 2026):

I can confirm a similar but slightly different issue. DDC control worked fine on macOS Tahoe 26.02, but after updating to 26.03 it stopped working completely — not just laggy, but entirely unresponsive.
Environment:

macOS version: Tahoe 26.03
Mac model: MacBook Air M4
MonitorControl version: 4.3.3
Monitor: MSI G321CUV connected via HDMI
Apple Silicon: yes

Symptoms:

The MonitorControl sliders can be moved but have no effect
The macOS system volume slider is completely greyed out in System Settings → Sound
Volume cannot be changed via keyboard keys or Control Center
Everything worked fine on Tahoe 26.02 — the issue appeared immediately after updating to 26.03

This suggests something changed specifically in 26.03 regarding HDMI audio classification, causing macOS to treat the monitor as a fixed-volume device and blocking DDC communication entirely.

@vocky8 commented on GitHub (Mar 5, 2026): I can confirm a similar but slightly different issue. DDC control worked fine on macOS Tahoe 26.02, but after updating to 26.03 it stopped working completely — not just laggy, but entirely unresponsive. Environment: macOS version: Tahoe 26.03 Mac model: MacBook Air M4 MonitorControl version: 4.3.3 Monitor: MSI G321CUV connected via HDMI Apple Silicon: yes Symptoms: The MonitorControl sliders can be moved but have no effect The macOS system volume slider is completely greyed out in System Settings → Sound Volume cannot be changed via keyboard keys or Control Center Everything worked fine on Tahoe 26.02 — the issue appeared immediately after updating to 26.03 This suggests something changed specifically in 26.03 regarding HDMI audio classification, causing macOS to treat the monitor as a fixed-volume device and blocking DDC communication entirely.