[GH-ISSUE #288] Brightness function not working for MX279 monitor #227

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opened 2026-05-05 05:27:43 -06:00 by gitea-mirror · 2 comments

gitea-mirror commented

2026-05-05 05:27:43 -06:00

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Originally created by @marfier on GitHub (Sep 16, 2020).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/288

Checklist

I have searched for existing issues
I have looked through the Monitor Troubleshooting wiki
I have updated MonitorControl to the latest version

Describe the issue
The volume functions works, but not the brightness function.

Expected behavior
For the brightness function to work.

Additional context
As per the Monitor Troubleshooting guide, I used ddcctl and ran ./ddcctl -d 1 -b 30, but I had no luck.

Environment Information (please complete the following information):

macOS version: 10.15.6
MonitorControl version: 2.0.0
Monitor(s): MX279
Mac model: MacBook Air 2020
Monitor Cable(s)/Connection(s): (e.g. DisplayPort) HDMI

Originally created by @marfier on GitHub (Sep 16, 2020). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/288 **Checklist**  - [x] I have searched for existing issues - [x] I have looked through [the Monitor Troubleshooting wiki](https://github.com/MonitorControl/MonitorControl/wiki/Monitor-Troubleshooting) - [x] I have updated MonitorControl to the latest version **Describe the issue** The volume functions works, but not the brightness function. **Expected behavior** For the brightness function to work.  **Additional context** As per the Monitor Troubleshooting guide, I used `ddcctl` and ran `./ddcctl -d 1 -b 30`, but I had no luck. **Environment Information (please complete the following information):** - macOS version: 10.15.6 - MonitorControl version: 2.0.0 - Monitor(s): MX279 - Mac model: MacBook Air 2020 - Monitor Cable(s)/Connection(s): (e.g. DisplayPort) HDMI

gitea-mirror

2026-05-05 05:27:43 -06:00

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gitea-mirror commented

2026-05-05 05:27:50 -06:00

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@JoniVR commented on GitHub (Sep 19, 2020):

If it doesn't work with ddcctl either then I'm afraid it's probably simply bad implementation of the VESA spec..? Did you try the different cables etc? (probably won't do much if volume already works but worth a shot).

@JoniVR commented on GitHub (Sep 19, 2020): If it doesn't work with ddcctl either then I'm afraid it's probably simply bad implementation of the VESA spec..? Did you try the different cables etc? (probably won't do much if volume already works but worth a shot).

gitea-mirror commented

2026-05-05 05:27:51 -06:00

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@marfier commented on GitHub (Sep 22, 2020):

I fixed this issue by resetting my integrated monitor config on the OSD. It turns out my monitor does support DDC, but there was an issue with the config. Thank you for such a great software!

@marfier commented on GitHub (Sep 22, 2020): I fixed this issue by resetting my integrated monitor config on the OSD. It turns out my monitor does support DDC, but there was an issue with the config. Thank you for such a great software!