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[GH-ISSUE #1099] Dell U2723QE: Flickering at 100% brightness #650

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opened 2026-05-05 06:26:31 -06:00 by gitea-mirror · 10 comments

gitea-mirror commented

2026-05-05 06:26:31 -06:00

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Originally created by @frogg on GitHub (Jul 4, 2022).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1099

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

I noticed an unexpected behavior where my Dell U2723QE starts flickering when I set it to 100% brightness via the MonitorControl slider in the menu bar.

First I though it might be a hardware defect, but then I made an experiment:

enabled advanced settings
set max DCC brightness to 10 (monitor gets quite dark)
set the slider to 100% brightness → flickering even at low brightness
putting the slider at 99% works fine

Expected behavior

100% brightness without flickering.

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: 12.4 (21F79)
- Mac model: 14“ M1 Pro Macbook Pro
- MonitorControl version: 4.1.0
- Monitor(s): Dell U2723QE
- Monitor Cable(s)/Connection(s): Display Port
- Apple Silicon/M1 (yes or no): yes

Originally created by @frogg on GitHub (Jul 4, 2022). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1099 ### 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 I noticed an unexpected behavior where my Dell U2723QE starts flickering when I set it to 100% brightness via the MonitorControl slider in the menu bar. First I though it might be a hardware defect, but then I made an experiment: - enabled advanced settings - set max DCC brightness to 10 (monitor gets quite dark) - set the slider to 100% brightness → flickering even at low brightness - putting the slider at 99% works fine ### Expected behavior 100% brightness without flickering. ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: 12.4 (21F79) - Mac model: 14“ M1 Pro Macbook Pro - MonitorControl version: 4.1.0 - Monitor(s): Dell U2723QE - Monitor Cable(s)/Connection(s): Display Port - Apple Silicon/M1 (yes or no): yes ```

gitea-mirror

2026-05-05 06:26:31 -06:00

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gitea-mirror commented

2026-05-05 06:26:38 -06:00

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@the0neyouseek commented on GitHub (Jul 4, 2022):

That's weird, I have the same setup (same monitor and device) but I don't have this issue. The only thing different is I'm using an usb-c cable and not a dp one. Maybe try checking with another cable to see if you still have this issue. Also try changing the brightness using the monitor hud to 100% to check if it's also cause a flickering, if it does then it could be a monitor or cable issue.

@the0neyouseek commented on GitHub (Jul 4, 2022): That's weird, I have the same setup (same monitor and device) but I don't have this issue. The only thing different is I'm using an usb-c cable and not a dp one. Maybe try checking with another cable to see if you still have this issue. Also try changing the brightness using the monitor hud to 100% to check if it's also cause a flickering, if it does then it could be a monitor or cable issue.

gitea-mirror commented

2026-05-05 06:26:40 -06:00

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@frogg commented on GitHub (Jul 4, 2022):

Using the monitor’s controls to set brightness to 100% doesn't result in flickering.
Also, actually right now I am not able to reproduce the issue anymore (it started two days ago, and just disappeared).
Not sure why, to be honest. I will report back if it comes back!

@frogg commented on GitHub (Jul 4, 2022): Using the monitor’s controls to set brightness to 100% doesn't result in flickering. Also, actually right now I am not able to reproduce the issue anymore (it started two days ago, and just disappeared). Not sure why, to be honest. I will report back if it comes back!

gitea-mirror commented

2026-05-05 06:26:42 -06:00

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@waydabber commented on GitHub (Jul 8, 2022):

Hey @frogg - let me know if this returns or if we can file it under mysteries in life and close the issue. :)

@waydabber commented on GitHub (Jul 8, 2022): Hey @frogg - let me know if this returns or if we can file it under `mysteries in life` and close the issue. :)

gitea-mirror commented

2026-05-05 06:26:43 -06:00

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@frogg commented on GitHub (Jul 8, 2022):

Hey @waydabber! So far, all good! If this returns I will reopen this issue :)

@frogg commented on GitHub (Jul 8, 2022): Hey @waydabber! So far, all good! If this returns I will reopen this issue :)

gitea-mirror commented

2026-05-05 06:26:46 -06:00

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@waydabber commented on GitHub (Jul 8, 2022):

All right, thanks, I'll close it now then. :)

@waydabber commented on GitHub (Jul 8, 2022): All right, thanks, I'll close it now then. :)

gitea-mirror commented

2026-05-05 06:26:47 -06:00

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@frogg commented on GitHub (Jul 16, 2022):

Hello, would like to reopen this issue because I can now reproduce it once again:

Changing the brightness manually to 100% using the built-in monitor controls: no flickering.

I noticed however, that MonitorControl seems to constantly dismiss the built-in menu when the flickering is occurring.
My understanding is now, that MC might constantly send the "increase brightness" command in a loop which causes the flickering?

Edit: made a quick video demoing the problem

https://user-images.githubusercontent.com/5204169/179357473-569acaa9-1cd8-4c9f-8da4-f05ef88d0aae.mp4

@frogg commented on GitHub (Jul 16, 2022): Hello, would like to reopen this issue because I can now reproduce it once again: Changing the brightness manually to 100% using the built-in monitor controls: no flickering. I noticed however, that MonitorControl seems to constantly dismiss the built-in menu when the flickering is occurring. My understanding is now, that MC might constantly send the "increase brightness" command in a loop which causes the flickering? Edit: made a quick video demoing the problem https://user-images.githubusercontent.com/5204169/179357473-569acaa9-1cd8-4c9f-8da4-f05ef88d0aae.mp4

gitea-mirror commented

2026-05-05 06:26:49 -06:00

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@frogg commented on GitHub (Nov 2, 2022):

Hello, this is still an issue that persists until today. Only when increasing the brightness to 100% using MonitorControl, increasing it via the built-in controls of the monitor works fine.
I am on the latest release: 4.1.0

@frogg commented on GitHub (Nov 2, 2022): Hello, this is still an issue that persists until today. Only when increasing the brightness to 100% using MonitorControl, increasing it via the built-in controls of the monitor works fine. I am on the latest release: `4.1.0`

gitea-mirror commented

2026-05-05 06:26:52 -06:00

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@the0neyouseek commented on GitHub (Nov 2, 2022):

I can confirm this, I saw it too last week, but I can't seem to reproduce it every time

@the0neyouseek commented on GitHub (Nov 2, 2022): I can confirm this, I saw it too last week, but I can't seem to reproduce it every time

gitea-mirror commented

2026-05-05 06:26:53 -06:00

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@frogg commented on GitHub (Nov 2, 2022):

I can confirm this, I saw it too last week, but I can't seem to reproduce it every time

Indeed, it seems a bit inconsistent (or maybe it’s just not as notable always).
During the day when it’s generally brighter I don't notice the flickering as much compared to at night.
Also it’s more notable when bright/white content is displayed, in dark mode with lots of dark/black UI elements, its less intense/notable.

@frogg commented on GitHub (Nov 2, 2022): > I can confirm this, I saw it too last week, but I can't seem to reproduce it every time Indeed, it seems a bit inconsistent (or maybe it’s just not as notable always). During the day when it’s generally brighter I don't notice the flickering as much compared to at night. Also it’s more notable when bright/white content is displayed, in dark mode with lots of dark/black UI elements, its less intense/notable.

gitea-mirror commented

2026-05-05 06:26:54 -06:00

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@the0neyouseek commented on GitHub (Nov 2, 2022):

Okay so this seems to be an issue with the monitor and not with the app as I've got the issue right now and MonitorControl is not launched. Changing brightness with the hud also does not fix the issue.

@the0neyouseek commented on GitHub (Nov 2, 2022): Okay so this seems to be an issue with the monitor and not with the app as I've got the issue right now and MonitorControl is not launched. Changing brightness with the hud also does not fix the issue.

gitea-mirror referenced this issue

2026-05-05 07:06:11 -06:00

[PR #650] [CLOSED] Fix layout issue + 'Quit application' text in Preferences #1153