[GH-ISSUE #317] Not Working for 3 Monitors in Mac Mini 2018 #248

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opened 2026-05-05 05:30:26 -06:00 by gitea-mirror · 2 comments

gitea-mirror commented

2026-05-05 05:30:26 -06:00

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Originally created by @acsusanto on GitHub (Nov 2, 2020).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/317

Checklist

I have searched for existing issues
I have looked through the wiki
I have updated MonitorControl to the latest version

Describe the bug
A clear and concise description of what the bug is.
I am able to control 2 out of the three monitors that are connected to the mac mini. The two monitors connected to usb c works when I use the keys to dim the monitors. But the one with the HDMI cable doesn't work. It stays at the same brightness. I have tried setting it to "Brightness Only" and "Both Brightness and volume", both of them doesn't work.

I have set "Change Brightness/Volume for all screens" and it still doesn't work with the monitor connected to HDMI 2.0.
Setting it otherwise still doesn't work as well.

Environment Information (please complete the following information):

macOS version: 10.15.7
MonitorControl version: 2.1.0 (Build 721)
Monitor(s): 3

Originally created by @acsusanto on GitHub (Nov 2, 2020). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/317 **Checklist**  - [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** A clear and concise description of what the bug is. I am able to control 2 out of the three monitors that are connected to the mac mini. The two monitors connected to usb c works when I use the keys to dim the monitors. But the one with the HDMI cable doesn't work. It stays at the same brightness. I have tried setting it to "Brightness Only" and "Both Brightness and volume", both of them doesn't work. - I have set "Change Brightness/Volume for all screens" and it still doesn't work with the monitor connected to HDMI 2.0. - Setting it otherwise still doesn't work as well. **Environment Information (please complete the following information):** - macOS version: 10.15.7 - MonitorControl version: 2.1.0 (Build 721) - Monitor(s): 3

gitea-mirror

2026-05-05 05:30:26 -06:00

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gitea-mirror commented

2026-05-05 05:30:31 -06:00

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@JoniVR commented on GitHub (Nov 2, 2020):

The troubleshooting wiki mentions that HDMI is the least reliable way, this is probably your issue, DDC works best (in my experience) with displayport. Probably not a bug but a cable issue, you can try a different HDMI cable (the cheap ones from Amazon usually don't work) to see if that helps but it's not a guarantee.

Closing this as I don't feel like this is a bug and it's well documented, feel free to reopen if you feel that my assumption here is wrong.

@JoniVR commented on GitHub (Nov 2, 2020): The troubleshooting wiki mentions that HDMI is the least reliable way, this is probably your issue, DDC works best (in my experience) with displayport. Probably not a bug but a cable issue, you can try a different HDMI cable (the cheap ones from Amazon usually don't work) to see if that helps but it's not a guarantee. Closing this as I don't feel like this is a bug and it's well documented, feel free to reopen if you feel that my assumption here is wrong.

gitea-mirror commented

2026-05-05 05:30:33 -06:00

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@acsusanto commented on GitHub (Nov 3, 2020):

Hi.Thanks for the heads up. Will try your solution.

Yours Sincerely,
Alexander

On 3 Nov 2020, at 01.09, Joni Van Roost notifications@github.com wrote:

The troubleshooting wiki mentions that HDMI is the least reliable way, this is probably your issue, DDC works best (in my experience) with displayport. Probably not a bug but a cable issue, you can try a different HDMI cable (the cheap ones from Amazon usually don't work) to see if that helps but it's not a guarantee.

Closing this as I don't feel like this is a bug and it's well documented, feel free to reopen if you feel that my assumption here is wrong.

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@acsusanto commented on GitHub (Nov 3, 2020): Hi.Thanks for the heads up. Will try your solution. Yours Sincerely, Alexander > On 3 Nov 2020, at 01.09, Joni Van Roost <notifications@github.com> wrote: > > > The troubleshooting wiki mentions that HDMI is the least reliable way, this is probably your issue, DDC works best (in my experience) with displayport. Probably not a bug but a cable issue, you can try a different HDMI cable (the cheap ones from Amazon usually don't work) to see if that helps but it's not a guarantee. > > Closing this as I don't feel like this is a bug and it's well documented, feel free to reopen if you feel that my assumption here is wrong. > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FMonitorControl%2FMonitorControl%2Fissues%2F317%23issuecomment-720637319&data=04%7C01%7C%7Cf032f5e81604444c0a5c08d87f5a731c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637399373734515391%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=hRl5gZ1fBg9GfZg64M3Ezn%2BRyR6xp6%2F2gqXJgnVFF1s%3D&reserved=0>, or unsubscribe <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAB65PERFD5XHQCUXGZDH7LTSN3YVXANCNFSM4THQXWHQ&data=04%7C01%7C%7Cf032f5e81604444c0a5c08d87f5a731c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637399373734525371%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=AebjiIzCQSckcMWuFyhPN4LGAlseAFUa6wrdmU6Vgno%3D&reserved=0>. >