[GH-ISSUE #366] Not Working on Macbook Pro screen with Catalina 10.15.7 #289

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opened 2026-05-05 05:41:49 -06:00 by gitea-mirror · 14 comments
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Originally created by @starmandeluxe on GitHub (Jan 7, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/366

Originally assigned to: @waydabber on GitHub.

Checklist

  • [x ] I have searched for existing issues
  • [x ] I have looked through the wiki
  • [ x] I have updated MonitorControl to the latest version

Describe the bug
I want to change the brightness of the laptop's screen itself but the menu only shows "No supported display found"

To Reproduce
Steps to reproduce the behavior:

  1. Go to the brightness icon in the system top bar
  2. Click on the brightness icon
  3. Cannot control brightness on the Macbook's monitor

Expected behavior
A slider to be able to control the Macbook's monitor brightness (see thread here: https://forums.macrumors.com/threads/menu-bar-brightness-slider.2105286/)

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
Add any other context about the problem here.

Environment Information (please complete the following information):

  • macOS version: Catalina 10.15.7
  • MonitorControl version: 2.1.0
  • Monitor(s): Macbook Pro
Originally created by @starmandeluxe on GitHub (Jan 7, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/366 Originally assigned to: @waydabber on GitHub. **Checklist** <!-- Before you submit your issue, please make sure to check the following boxes by putting an x in the [ ] (don't: [x ], [ x], do: [x]) --> - [x ] I have searched for existing issues - [x ] I have looked through [the wiki](https://github.com/MonitorControl/MonitorControl/wiki) - [ x] I have updated MonitorControl to the latest version **Describe the bug** I want to change the brightness of the laptop's screen itself but the menu only shows "No supported display found" **To Reproduce** Steps to reproduce the behavior: 1. Go to the brightness icon in the system top bar 2. Click on the brightness icon 3. Cannot control brightness on the Macbook's monitor **Expected behavior** A slider to be able to control the Macbook's monitor brightness (see thread here: https://forums.macrumors.com/threads/menu-bar-brightness-slider.2105286/) **Screenshots** If applicable, add screenshots to help explain your problem. **Additional context** Add any other context about the problem here. **Environment Information (please complete the following information):** - macOS version: Catalina 10.15.7 - MonitorControl version: 2.1.0 - Monitor(s): Macbook Pro
gitea-mirror 2026-05-05 05:41:49 -06:00
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@PrincipeAzzurro commented on GitHub (Feb 3, 2021):

Same issue here, stopped working after updating to 10.15.7 and applying Apple's last security update.
My monitor is a DELL U4320Q, worked perfectly well before - thank you BTW, MonitorControl is a very welcome piece of software that has made it straight into my "essentials" folder.

<!-- gh-comment-id:772703484 --> @PrincipeAzzurro commented on GitHub (Feb 3, 2021): Same issue here, stopped working after updating to 10.15.7 and applying Apple's last security update. My monitor is a DELL U4320Q, worked perfectly well before - thank you BTW, MonitorControl is a very welcome piece of software that has made it straight into my "essentials" folder.
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@starmandeluxe commented on GitHub (Feb 8, 2021):

@PrincipeAzzurro If your issue is with your DELL U4320Q monitor, then your issue is not the same as the one reported in this issue. This issue is for the Macbook Pro screen. Please create a new Github issue if you are using an external monitor.

<!-- gh-comment-id:775001441 --> @starmandeluxe commented on GitHub (Feb 8, 2021): @PrincipeAzzurro If your issue is with your DELL U4320Q monitor, then your issue is not the same as the one reported in this issue. This issue is for the Macbook Pro screen. Please create a new Github issue if you are using an external monitor.
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@eponymous301 commented on GitHub (Feb 18, 2021):

Might be a general 10.15.7 issue affecting all monitors - I have OS X 10.15.7 on my MacBook Pro (16-inch, 2019), installed MonitorControl (2.1.0 build 721) for the first time, and I see "No supported display found" - neither the laptop's internal display, nor my external USB monitors (AOC, https://us.aoc.com/en/monitors/i1659fwux) seem to be recognized as supporting DDC:

monitorControl screenshot

<!-- gh-comment-id:781542703 --> @eponymous301 commented on GitHub (Feb 18, 2021): Might be a general 10.15.7 issue affecting all monitors - I have OS X 10.15.7 on my MacBook Pro (16-inch, 2019), installed MonitorControl (2.1.0 build 721) for the first time, and I see "No supported display found" - neither the laptop's internal display, nor my external USB monitors (AOC, https://us.aoc.com/en/monitors/i1659fwux) seem to be recognized as supporting DDC: ![monitorControl screenshot](https://user-images.githubusercontent.com/29875759/108402750-c9582500-71d2-11eb-84f0-40c252dbb36e.png)
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@LandonSchropp commented on GitHub (Mar 15, 2021):

I'm having the same issue as the original poster. This app works great when connected to my LG monitor. However, if I disconnect from a monitor, I also get a "No supported display found" message for the built-in display.

<!-- gh-comment-id:799563668 --> @LandonSchropp commented on GitHub (Mar 15, 2021): I'm having the same issue as the original poster. This app works great when connected to my LG monitor. However, if I *disconnect* from a monitor, I also get a "No supported display found" message for the built-in display.
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@danielyaa5 commented on GitHub (May 10, 2021):

experiencing the same thing on 10.15.7

<!-- gh-comment-id:836098820 --> @danielyaa5 commented on GitHub (May 10, 2021): experiencing the same thing on 10.15.7
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@danielyaa5 commented on GitHub (May 10, 2021):

I just found out you can adjust the laptop screen brightness with control + f1 / f2

<!-- gh-comment-id:836101021 --> @danielyaa5 commented on GitHub (May 10, 2021): I just found out you can adjust the laptop screen brightness with control + f1 / f2
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@LandonSchropp commented on GitHub (May 10, 2021):

I wish that I could disable the app when it's not connected to a screen, and enable it when it is. Right now, I quit and restart the app when I plug and unplug.

<!-- gh-comment-id:836894530 --> @LandonSchropp commented on GitHub (May 10, 2021): I wish that I could disable the app when it's not connected to a screen, and enable it when it is. Right now, I quit and restart the app when I plug and unplug.
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@waydabber commented on GitHub (Aug 21, 2021):

I think this issue is not relevant anymore, so I'll close it but let me know if this issue persists in a comment anyway! Thank you!

@LandonSchropp - this issue was added to the new 3.0.0 version which is out now.

<!-- gh-comment-id:903122296 --> @waydabber commented on GitHub (Aug 21, 2021): I think this issue is not relevant anymore, so I'll close it but let me know if this issue persists in a comment anyway! Thank you! @LandonSchropp - this issue was added to the new 3.0.0 version which is out now.
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@starmandeluxe commented on GitHub (Aug 24, 2021):

I think this issue is not relevant anymore, so I'll close it but let me know if this issue persists in a comment anyway! Thank you!

@LandonSchropp - this issue was added to the new 3.0.0 version which is out now.

@waydabber Your update did not fix the issue. I tried the new version and while I can now see my Macbook Pro built-in screen recognized, there are no brightness controls for it and the preferences for it are grayed out.

<!-- gh-comment-id:904282278 --> @starmandeluxe commented on GitHub (Aug 24, 2021): > I think this issue is not relevant anymore, so I'll close it but let me know if this issue persists in a comment anyway! Thank you! > > @LandonSchropp - this issue was added to the new 3.0.0 version which is out now. @waydabber Your update did not fix the issue. I tried the new version and while I can now see my Macbook Pro built-in screen recognized, there are no brightness controls for it and the preferences for it are grayed out.
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@LandonSchropp commented on GitHub (Aug 24, 2021):

@starmandeluxe That's odd, it's been working great for me.

Here are my preferences if that's helpful:

Screen Shot 2021-08-23 at 10 18 50 PM Screen Shot 2021-08-23 at 10 18 33 PM

I use the built-in keyboard brightness controls to control my MacBook—I'm not sure if you're trying to use a different mechanism such as the slider.

Also, why did you thumbs down all of the comments in this issue?

<!-- gh-comment-id:904291808 --> @LandonSchropp commented on GitHub (Aug 24, 2021): @starmandeluxe That's odd, it's been working great for me. Here are my preferences if that's helpful: <img width="713" alt="Screen Shot 2021-08-23 at 10 18 50 PM" src="https://user-images.githubusercontent.com/361591/130550415-466f06a1-f5a3-41fa-be09-1f63e15ebc63.png"> <img width="710" alt="Screen Shot 2021-08-23 at 10 18 33 PM" src="https://user-images.githubusercontent.com/361591/130550398-8a22cd29-a9e2-42a8-a6bf-fffbc2472c33.png"> I use the built-in keyboard brightness controls to control my MacBook—I'm not sure if you're trying to use a different mechanism such as the slider. Also, why did you thumbs down all of the comments in this issue?
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@waydabber commented on GitHub (Aug 24, 2021):

Hi all, the internal screen has no slider by design currently (as it can be controlled by the slider provided by the OS - in Big Sur and up). There is a plan to add the slider as an option:

https://github.com/MonitorControl/MonitorControl/issues/198

Please follow this issue.

Currently if only the internal display is present (there is no external display), MonitorControl disengages from the brightness keys and fully hands back control to the OS as this was an accepted feature request.

Hope this helps! Thank you!

<!-- gh-comment-id:904403558 --> @waydabber commented on GitHub (Aug 24, 2021): Hi all, the internal screen has no slider by design currently (as it can be controlled by the slider provided by the OS - in Big Sur and up). There is a plan to add the slider as an option: https://github.com/MonitorControl/MonitorControl/issues/198 Please follow this issue. Currently if only the internal display is present (there is no external display), MonitorControl disengages from the brightness keys and fully hands back control to the OS as this was an accepted feature request. Hope this helps! Thank you!
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@starmandeluxe commented on GitHub (Aug 25, 2021):

@LandonSchropp

I'm not sure if you're trying to use a different mechanism such as the slider.

I thought the main mechanism IS the slider. What other type of controls are available with this tool?

Also, why did you thumbs down all of the comments in this issue?

I only downvoted the ones that don't address my original bug report. Those comments are discussing an issue different from the one reported, and therefore off-topic.

<!-- gh-comment-id:905716659 --> @starmandeluxe commented on GitHub (Aug 25, 2021): @LandonSchropp > I'm not sure if you're trying to use a different mechanism such as the slider. I thought the main mechanism IS the slider. What other type of controls are available with this tool? > Also, why did you thumbs down all of the comments in this issue? I only downvoted the ones that don't address my original bug report. Those comments are discussing an issue different from the one reported, and therefore off-topic.
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@waydabber commented on GitHub (Aug 25, 2021):

Hi @starmandeluxe, the brightness and volume can be controlled via the Apple keyboard's native media keys (brightness, mute, volume keys) as well as with the menu slider. The menu slider is currently available for the external displays only (since the internal display already has its own slider in macOS control center).

We plan to add an option to show the brightness slider for the built-in display as well.

<!-- gh-comment-id:905740160 --> @waydabber commented on GitHub (Aug 25, 2021): Hi @starmandeluxe, the brightness and volume can be controlled via the Apple keyboard's native media keys (brightness, mute, volume keys) as well as with the menu slider. The menu slider is currently available for the external displays only (since the internal display already has its own slider in macOS control center). We plan to add an option to show the brightness slider for the built-in display as well.
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@waydabber commented on GitHub (Sep 3, 2021):

There is a build in the following issue thread with slider for built-in screens (and also proper support for Apple displays): https://github.com/MonitorControl/MonitorControl/issues/539

<!-- gh-comment-id:912829142 --> @waydabber commented on GitHub (Sep 3, 2021): There is a build in the following issue thread with slider for built-in screens (and also proper support for Apple displays): https://github.com/MonitorControl/MonitorControl/issues/539
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Reference: github-starred/MonitorControl#289
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