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[GH-ISSUE #931] Built-in display will sometimes flash when the "automatically adjust brightness" is on. #572

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opened 2026-05-05 06:16:41 -06:00 by gitea-mirror · 5 comments

gitea-mirror commented

2026-05-05 06:16:41 -06:00

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Originally created by @yuchengruan on GitHub (Feb 3, 2022).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/931

Before opening the issue, have you...?

Searched for existing issues
Looked through the wiki
Updated MonitorControl to the latest version (if applicable)

Describe the bug

For example, when I set the brightness to 80 (range: 0-100) and the light condition changes, the brightness is switched to 10 automatically. At the moment, if I adjust the brightness using the app shortcuts, the built-in monitor will flash, which means the brightness will jump to 80 and then back to around 10 almost simultaneously.

Steps to reproduce

You can reproduce this bug as I mentioned above but I'm not sure if this only appears on my Mac.

Expected behavior

The app is supposed to adjust the brightness without any flashing on built-in display.

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: 12.1 Monterey
- Mac model: Macbook Pro (13-inch, 2020)
- MonitorControl version: v4.0.2
- Monitor(s): ASUS VA24E
- Apple Silicon/M1 (yes or no): yes

Originally created by @yuchengruan on GitHub (Feb 3, 2022). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/931 ### Before opening the issue, have you...? - [X] Searched for existing issues - [X] Looked through [the wiki](https://github.com/MonitorControl/MonitorControl/wiki) - [X] Updated MonitorControl to the latest version (if applicable) ### Describe the bug For example, when I set the brightness to 80 (range: 0-100) and the light condition changes, the brightness is switched to 10 automatically. At the moment, if I adjust the brightness using the app shortcuts, the built-in monitor will flash, which means the brightness will jump to 80 and then back to around 10 almost simultaneously. ### Steps to reproduce You can reproduce this bug as I mentioned above but I'm not sure if this only appears on my Mac. ### Expected behavior The app is supposed to adjust the brightness without any flashing on built-in display. ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: 12.1 Monterey - Mac model: Macbook Pro (13-inch, 2020) - MonitorControl version: v4.0.2 - Monitor(s): ASUS VA24E - Apple Silicon/M1 (yes or no): yes ```

gitea-mirror

2026-05-05 06:16:41 -06:00

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gitea-mirror commented

2026-05-05 06:16:46 -06:00

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@waydabber commented on GitHub (Feb 3, 2022):

Yes, this is an issue - in certain circumstances the app does not deal with the fact that the brightness is unexpectedly changed by the OS. This could be fixed by queriying the current panel brightness and updating the app's internal representation in this regard when changing the brightness.

@waydabber commented on GitHub (Feb 3, 2022): Yes, this is an issue - in certain circumstances the app does not deal with the fact that the brightness is unexpectedly changed by the OS. This could be fixed by queriying the current panel brightness and updating the app's internal representation in this regard when changing the brightness.

gitea-mirror commented

2026-05-05 06:16:49 -06:00

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@waydabber commented on GitHub (Apr 11, 2022):

Ok, this issue is deeper, the app does not behave properly even when the change is known. See this one: https://github.com/MonitorControl/MonitorControl/issues/1000#issuecomment-1095121770

@waydabber commented on GitHub (Apr 11, 2022): Ok, this issue is deeper, the app does not behave properly even when the change is known. See this one: https://github.com/MonitorControl/MonitorControl/issues/1000#issuecomment-1095121770

gitea-mirror commented

2026-05-05 06:16:51 -06:00

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@stale[bot] commented on GitHub (Apr 11, 2023):

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require attention? This issue may be closed if no further activity occurs. Thank you for your contributions.

@stale[bot] commented on GitHub (Apr 11, 2023): Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require attention? This issue may be closed if no further activity occurs. Thank you for your contributions.

gitea-mirror commented

2026-05-05 06:16:53 -06:00

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@mecirmartin commented on GitHub (Aug 8, 2023):

Hey, @waydabber why is this issue closed?
I'm experiencing similar bug with my macbook m1 air connected with usb-c cable to Dell monitor
However this issue is really infrequent (happens once a 2-3 weeks) and i'm not really sure what causes the issue

The screen on external monitor flashes even after the device is disconnected (i can see the dell overlay flashing)

@mecirmartin commented on GitHub (Aug 8, 2023): Hey, @waydabber why is this issue closed? I'm experiencing similar bug with my macbook m1 air connected with usb-c cable to Dell monitor However this issue is really infrequent (happens once a 2-3 weeks) and i'm not really sure what causes the issue The screen on external monitor flashes even after the device is disconnected (i can see the dell overlay flashing)

gitea-mirror commented

2026-05-05 06:16:54 -06:00

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@waydabber commented on GitHub (Aug 8, 2023):

Hi, it was closed by a stale bot automatically.

@waydabber commented on GitHub (Aug 8, 2023): Hi, it was closed by a stale bot automatically.