[GH-ISSUE #1004] Apple 24" Cinema Display no longer reaching full brightness #605

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opened 2026-05-05 06:21:36 -06:00 by gitea-mirror · 2 comments

gitea-mirror commented

2026-05-05 06:21:36 -06:00

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Originally created by @SkipLesion on GitHub (Apr 14, 2022).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1004

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 have a 24" Apple LED Cinema Display - after installing the app I can control the brightness - but from 0 to about 30%. Previously the display was dim and I couldn't adjust with my M1 MacBookPro as there was no Brightness slider for my external monitor. I managed to set it to full brightness by using an ancient MacBook Air. So ti has been on full brightness - until now, when I can't get it above approx 30% - even though the slider in the app goes to full brightness. I'm norw struggling to read my display :-(

Expected behavior

I expected to be able to run my display at full brightness

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: 12.3.1
- Mac model: MacBook Pro (14-inch, 2021) Apple M1 Pro
- MonitorControl version: 4.0.2
- Monitor(s): Apple 24" LED Cinema Display
- Monitor Cable(s)/Connection(s): USB-C adapter
- Apple Silicon/M1 (yes or no): Yes

Originally created by @SkipLesion on GitHub (Apr 14, 2022). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/1004 ### 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 have a 24" Apple LED Cinema Display - after installing the app I can control the brightness - but from 0 to about 30%. Previously the display was dim and I couldn't adjust with my M1 MacBookPro as there was no Brightness slider for my external monitor. I managed to set it to full brightness by using an ancient MacBook Air. So ti has been on full brightness - until now, when I can't get it above approx 30% - even though the slider in the app goes to full brightness. I'm norw struggling to read my display :-( ### Expected behavior I expected to be able to run my display at full brightness ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: 12.3.1 - Mac model: MacBook Pro (14-inch, 2021) Apple M1 Pro - MonitorControl version: 4.0.2 - Monitor(s): Apple 24" LED Cinema Display - Monitor Cable(s)/Connection(s): USB-C adapter - Apple Silicon/M1 (yes or no): Yes ```

gitea-mirror closed this issue

2026-05-05 06:21:39 -06:00

gitea-mirror commented

2026-05-05 06:21:42 -06:00

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@waydabber commented on GitHub (Apr 14, 2022):

Hi there, see these for possible solutions:

https://github.com/MonitorControl/MonitorControl/discussions?discussions_q=apple+cinema

@waydabber commented on GitHub (Apr 14, 2022): Hi there, see these for possible solutions: https://github.com/MonitorControl/MonitorControl/discussions?discussions_q=apple+cinema

gitea-mirror commented

2026-05-05 06:21:45 -06:00

Author

Owner

@SkipLesion commented on GitHub (Apr 14, 2022):

Dear Istvan,

Many thanks indeed - this has worked perfectly for me and solved my problem - many thanks indeed.

My apologies for not finding the original discussion and thank you so much for your rapid and helpful reply.

And most of all many thanks for creating this app to restore controllable brightness to my ancient but otherwise brilliant display!

Kind regards,

John

On 14 Apr 2022, at 13:48, Istvan Toth @.@.>> wrote:

Hi there, see these for possible solutions:

https://github.com/MonitorControl/MonitorControl/discussions?discussions_q=apple+cinema https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FMonitorControl%2FMonitorControl%2Fdiscussions%3Fdiscussions_q%3Dapple%2Bcinema&data=04%7C01%7Cjal70%40universityofcambridgecloud.onmicrosoft.com%7C0500abcc4d6641952af508da1e1508d3%7C49a50445bdfa4b79ade3547b4f3986e9%7C0%7C0%7C637855372928417136%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=w%2FYqWPSkrrZ6bWI%2FnRVfQ7YNbHzG1Em2nd8skBFSm6g%3D&reserved=0

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@SkipLesion commented on GitHub (Apr 14, 2022): Dear Istvan, Many thanks indeed - this has worked perfectly for me and solved my problem - many thanks indeed. My apologies for not finding the original discussion and thank you so much for your rapid and helpful reply. And most of all many thanks for creating this app to restore controllable brightness to my ancient but otherwise brilliant display! Kind regards, John On 14 Apr 2022, at 13:48, Istvan Toth ***@***.******@***.***>> wrote: Hi there, see these for possible solutions: https://github.com/MonitorControl/MonitorControl/discussions?discussions_q=apple+cinema<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FMonitorControl%2FMonitorControl%2Fdiscussions%3Fdiscussions_q%3Dapple%2Bcinema&data=04%7C01%7Cjal70%40universityofcambridgecloud.onmicrosoft.com%7C0500abcc4d6641952af508da1e1508d3%7C49a50445bdfa4b79ade3547b4f3986e9%7C0%7C0%7C637855372928417136%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=w%2FYqWPSkrrZ6bWI%2FnRVfQ7YNbHzG1Em2nd8skBFSm6g%3D&reserved=0> — Reply to this email directly, view it on GitHub<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FMonitorControl%2FMonitorControl%2Fissues%2F1004%23issuecomment-1099150547&data=04%7C01%7Cjal70%40universityofcambridgecloud.onmicrosoft.com%7C0500abcc4d6641952af508da1e1508d3%7C49a50445bdfa4b79ade3547b4f3986e9%7C0%7C0%7C637855372928417136%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=ZnXb%2B2mooM9fFvO7Wk28%2FOfS9mMYHOwr0MUB7k8wf98%3D&reserved=0>, or unsubscribe<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAYWWXNSHM3RSHTAOHY6TFKTVFAHYTANCNFSM5TNNCNAQ&data=04%7C01%7Cjal70%40universityofcambridgecloud.onmicrosoft.com%7C0500abcc4d6641952af508da1e1508d3%7C49a50445bdfa4b79ade3547b4f3986e9%7C0%7C0%7C637855372928729557%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Z2t3Q00h%2BtCgkjNushaKomV3wFdGrwEHP6f%2FAkEuCSs%3D&reserved=0>. You are receiving this because you authored the thread.Message ID: ***@***.***>

gitea-mirror referenced this issue

2026-05-05 07:05:34 -06:00

[PR #605] [MERGED] Update Japanese translation #1133