[GH-ISSUE #926] Dell U2720Q is not controlled by the app when in DCI-P3 colour mode #569

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opened 2026-05-05 06:16:09 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 06:16:09 -06:00

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Originally created by @tyger on GitHub (Feb 1, 2022).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/926

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

MonitorControl works fine with Dell U2720Q and capable of controlling its brightness when monitor is pretty much any colour mode except for DCI-P3.
When I switch to DCI-P3 in monitor OSD menu it changes brightness, it is still possible to controll brightness with monitor itself, but MonitorControl has no effect on it.

Expected behavior

MonitorControl should be able to control brightness of the monitor when it is in DCI-P3 colour mode.

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: 12.2 Monterey
- Mac model: MacBook Pro (16-inch, 2021)
- MonitorControl version: v4.0.2
- Monitor(s): Dell U2720Q
- Monitor Cable(s)/Connection(s): USB-C to USB-C (came with monitor)
- Apple Silicon/M1 (yes or no): yes

Originally created by @tyger on GitHub (Feb 1, 2022). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/926 ### 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 MonitorControl works fine with Dell U2720Q and capable of controlling its brightness when monitor is pretty much any colour mode except for DCI-P3. When I switch to DCI-P3 in monitor OSD menu it changes brightness, it is still possible to controll brightness with monitor itself, but MonitorControl has no effect on it. ### Expected behavior MonitorControl should be able to control brightness of the monitor when it is in DCI-P3 colour mode. ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: 12.2 Monterey - Mac model: MacBook Pro (16-inch, 2021) - MonitorControl version: v4.0.2 - Monitor(s): Dell U2720Q - Monitor Cable(s)/Connection(s): USB-C to USB-C (came with monitor) - Apple Silicon/M1 (yes or no): yes ```

gitea-mirror

2026-05-05 06:16:09 -06:00

closed this issue
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gitea-mirror commented

2026-05-05 06:16:15 -06:00

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@waydabber commented on GitHub (Feb 2, 2022):

This seems to be a monitor specific issue, it seems like the display is not accepting DDC commands in this mode.

@waydabber commented on GitHub (Feb 2, 2022): This seems to be a monitor specific issue, it seems like the display is not accepting DDC commands in this mode.