[GH-ISSUE #1618] Volume control not working on iMac 2010 used as external monitor #903

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opened 2026-05-05 06:50:55 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 06:50:55 -06:00

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Originally created by @kilianekamp on GitHub (Sep 24, 2024).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1618

Before opening the issue, have you...?

Searched for existing issues
Read through the Monitor-Troubleshooting Wiki
Updated MonitorControl to the latest version (if applicable)

Describe the issue

The volume control is not working on my iMac 2010 27" that I use as an external monitor to my MacBook Air M3. The volume is always maxed out. I can move the slide in the MonitorControl app, but there's no actual change to the volume. Brightness control works just fine.

Expected behavior

I would like to change the actual volume of my monitor by moving the volume control slider.

Anything else?

These are my settings. If I uncheck "Use hardware DDC control", the volume slider disappears from the app.

Thank you for creating MonitorControl!

Environment Information (please complete the following information)

- macOS version: Sonoma 14.6
- Mac model: MacBook Air M3, 15", 2024
- MonitorControl version: 4.2.0 Build 7048
- Monitor(s): iMac Mid 2010, 27"
- Monitor Cable(s)/Connection(s): USB-C to Mini Displayport
- Apple Silicon/M1 (yes or no): Yes (M3)

Originally created by @kilianekamp on GitHub (Sep 24, 2024). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1618 ### Before opening the issue, have you...? - [X] Searched for existing issues - [X] Read through [the Monitor-Troubleshooting Wiki](https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting) - [X] Updated MonitorControl to the latest version (if applicable) ### Describe the issue The volume control is not working on my iMac 2010 27" that I use as an external monitor to my MacBook Air M3. The volume is always maxed out. I can move the slide in the MonitorControl app, but there's no actual change to the volume. Brightness control works just fine. ### Expected behavior I would like to change the actual volume of my monitor by moving the volume control slider. ### Anything else? These are my settings. If I uncheck "Use hardware DDC control", the volume slider disappears from the app. ![Screenshot 2024-09-24 at 21 33 16](https://github.com/user-attachments/assets/ca8b0041-52cc-4dbe-91ba-28f7f584d8aa) Thank you for creating MonitorControl! ### Environment Information (please complete the following information) ```markdown - macOS version: Sonoma 14.6 - Mac model: MacBook Air M3, 15", 2024 - MonitorControl version: 4.2.0 Build 7048 - Monitor(s): iMac Mid 2010, 27" - Monitor Cable(s)/Connection(s): USB-C to Mini Displayport - Apple Silicon/M1 (yes or no): Yes (M3) ```

gitea-mirror closed this issue

2026-05-05 06:50:57 -06:00

gitea-mirror commented

2026-05-05 06:51:00 -06:00

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@waydabber commented on GitHub (Sep 24, 2024):

The 27" iMac is not DDC compatible (in Target Display Mode) and does not support DDC volume control. This is why volume control does not work.

@waydabber commented on GitHub (Sep 24, 2024): The 27" iMac is not DDC compatible (in Target Display Mode) and does not support DDC volume control. This is why volume control does not work.