[GH-ISSUE #511] ViewSonic VG2439 not working [M1] #402

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opened 2026-05-05 05:55:15 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 05:55:15 -06:00

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Originally created by @bluSCALE4 on GitHub (Aug 11, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/511

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
Using slider or keyboard keys does not adjust brightness.

Expected behavior
Brightness should adjust.

Screenshots

Additional context
I've downloaded the latest experimental/apple-silicon branch and none of the betas recently released work. Beta3 showed DDC support. The brightness slider moved but did not actually do anything. Also up to version Beta3, when I tried to use keyboard shortcuts, a broken icon would appear with no gauge or icon, just the dark surrounding square.

Beta6 shows the sliders but they do not work. The settings do not show the monitors as supporting DDC.

Environment Information (please complete the following information):

macOS version:
MonitorControl version: Beta 6
Monitor(s): Vg2439
Mac model: Mac mini M1
Monitor Cable(s)/Connection(s): (e.g. DisplayPort) USB-C Hub (WavLink UG69PD2) USB-C -> DisplayPort
Apple Silicon/M1 (yes or no): yes

Originally created by @bluSCALE4 on GitHub (Aug 11, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/511 **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** Using slider or keyboard keys does not adjust brightness. **Expected behavior** Brightness should adjust. **Screenshots** ![Screen Shot 2021-08-11 at 5 40 36 PM](https://user-images.githubusercontent.com/200427/129112930-08fd78e1-5b42-4e27-bc38-b050e29dc2f5.png) ![Screen Shot 2021-08-11 at 5 41 44 PM](https://user-images.githubusercontent.com/200427/129112975-c67e0c52-413a-4366-8300-42c001c0ee95.png) **Additional context** I've downloaded the latest experimental/apple-silicon branch and none of the betas recently released work. Beta3 showed DDC support. The brightness slider moved but did not actually do anything. Also up to version Beta3, when I tried to use keyboard shortcuts, a broken icon would appear with no gauge or icon, just the dark surrounding square. Beta6 shows the sliders but they do not work. The settings do not show the monitors as supporting DDC. **Environment Information (please complete the following information):** - macOS version: - MonitorControl version: Beta 6 - Monitor(s): Vg2439 - Mac model: Mac mini M1 - Monitor Cable(s)/Connection(s): (e.g. DisplayPort) USB-C Hub (WavLink UG69PD2) USB-C -> DisplayPort - Apple Silicon/M1 (yes or no): yes

gitea-mirror closed this issue

2026-05-05 05:55:18 -06:00

gitea-mirror commented

2026-05-05 05:55:21 -06:00

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@waydabber commented on GitHub (Aug 12, 2021):

Hello, unfortunatelly this dock actually uses DisplayLink which is not the native hardware connection but more like a virtual display - eg AirPlay or SideCar but wired (displays connected natively always have an ID of 1 or 2 on M1 Macs).

DisplayLink does not support DDC on M1 macs. You can try to increase awareness about this here:

https://support.displaylink.com/forums/287786-displaylink-feature-suggestions/suggestions/16135240-add-brightness-support-to-non-windows-oses

@waydabber commented on GitHub (Aug 12, 2021): Hello, unfortunatelly this dock actually uses DisplayLink which is not the native hardware connection but more like a virtual display - eg AirPlay or SideCar but wired (displays connected natively always have an ID of 1 or 2 on M1 Macs). DisplayLink does not support DDC on M1 macs. You can try to increase awareness about this here: https://support.displaylink.com/forums/287786-displaylink-feature-suggestions/suggestions/16135240-add-brightness-support-to-non-windows-oses

gitea-mirror referenced this issue

2026-05-05 07:04:26 -06:00

[PR #402] [MERGED] update references to the0neyouseek with MonitorControl #1093