[GH-ISSUE #1835] Using the keyboard to control brightness, the external monitor has no response. #1006

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opened 2026-05-05 07:01:28 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 07:01:28 -06:00

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Originally created by @tzzs on GitHub (Jan 31, 2026).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1835

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

When using the keyboard to control brightness, the external monitor doesn’t respond. However, when adjusting brightness by dragging the slider in Control Center with the mouse, the external monitor’s brightness does change accordingly.

Steps to reproduce

Click Volumn Up
Built-in display brightness changes
External display brightness does not change

Expected behavior

The external display brightness should change synchronously.

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: MacOS 26.2
- Mac model:  MacBook Air(13-inch,2025)
- MonitorControl version: v4.3.3
- Monitor(s): AOC U27U3XD
- Apple Silicon/M1 (yes or no): yes

Originally created by @tzzs on GitHub (Jan 31, 2026). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1835 ### 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 When using the keyboard to control brightness, the external monitor doesn’t respond. However, when adjusting brightness by dragging the slider in Control Center with the mouse, the external monitor’s brightness does change accordingly. ### Steps to reproduce 1. Click Volumn Up 2. Built-in display brightness changes 3. External display brightness does not change ### Expected behavior The external display brightness should change synchronously. ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: MacOS 26.2 - Mac model: MacBook Air(13-inch,2025) - MonitorControl version: v4.3.3 - Monitor(s): AOC U27U3XD - Apple Silicon/M1 (yes or no): yes ```

gitea-mirror closed this issue

2026-05-05 07:01:30 -06:00

gitea-mirror commented

2026-05-05 07:01:35 -06:00

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

This might be a keyboard permission issue. Note: if you have brightness control for an external third party display, you are probably using it in HDR mode - this is not DDC control but the SDR peak brightness control, which is fine. MonitorControl is not really needed in this scenario imho.

@waydabber commented on GitHub (Feb 9, 2026): This might be a keyboard permission issue. Note: if you have brightness control for an external third party display, you are probably using it in HDR mode - this is not DDC control but the SDR peak brightness control, which is fine. MonitorControl is not really needed in this scenario imho.