[GH-ISSUE #1794] External monitor Brightness is automatically changing #988

New issue

Closed

opened 2026-05-05 07:00:22 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

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

Owner

Originally created by @codefrydev on GitHub (Sep 6, 2025).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1794

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

Issue: Screen brightness automatically changes when using dual Acer monitors on Mac mini (M4, latest macOS).

Details:

Setup: Mac mini M4 + 2 Acer monitors.
Problem: Brightness keeps adjusting automatically.
Note: This issue does not occur when using an Acer + Dell monitor combination — only happens with Acer + Acer setup.

Model:

Steps to reproduce

It happens Automatically dont know how to produce

Expected behavior

it should be consistant to the bright ness level i set

Anything else?

No response

Environment Information (please complete the following information)

- macOS version:  15.6 (24G84)
- Mac model: Apple Mac Mini M4
- MonitorControl version:4.3.3
- Monitor(s): Acers
- Apple Silicon/M1 (yes or no): M4

Originally created by @codefrydev on GitHub (Sep 6, 2025). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1794 ### 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 **Issue**: Screen brightness automatically changes when using dual Acer monitors on Mac mini (M4, latest macOS). **Details**: * Setup: Mac mini M4 + 2 Acer monitors. * Problem: Brightness keeps adjusting automatically. * Note: This issue does **not** occur when using an Acer + Dell monitor combination — only happens with Acer + Acer setup. **Model**: ![image](https://github.com/user-attachments/assets/13ea78d8-09bf-4a85-bb5e-cfad122057a0) ### Steps to reproduce It happens Automatically dont know how to produce ### Expected behavior it should be consistant to the bright ness level i set ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: 15.6 (24G84) - Mac model: Apple Mac Mini M4 - MonitorControl version:4.3.3 - Monitor(s): Acers - Apple Silicon/M1 (yes or no): M4 ```

gitea-mirror

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

closed this issue
added the
monitor Issue
label

gitea-mirror commented

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

Author

Owner

@waydabber commented on GitHub (Sep 7, 2025):

Not sure why this is - maybe it's an ambient light sensor feature on the display?

@waydabber commented on GitHub (Sep 7, 2025): Not sure why this is - maybe it's an ambient light sensor feature on the display?