[GH-ISSUE #735] Twin Screen M1 Brightness issue #483

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opened 2026-05-05 06:06:32 -06:00 by gitea-mirror · 2 comments

gitea-mirror commented

2026-05-05 06:06:32 -06:00

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Originally created by @danwilderspin on GitHub (Oct 22, 2021).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/735

Originally assigned to: @waydabber on GitHub.

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

I have 2 x 27 display port screens connected to my m1 Mac mini. One connect via cdmi adapter one into a usb adapter.

Functionality worked fine until beta 8 of Monterey so I switched to this great app. It works well except my left hand (usb to display port) screen at 'full brightness' is only at 1/2 brightness compared to the other screen.

Steps to reproduce

connect two screen to the mini, one via usb adapted one via cdmi adapter.

Expected behavior

both screens to be the same brightness

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: Monterey RC2
- Mac model: Mini M1
- MonitorControl version:4.0.0
- Monitor(s):2x displayport
- Apple Silicon/M1 (yes or no): yes

Originally created by @danwilderspin on GitHub (Oct 22, 2021). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/735 Originally assigned to: @waydabber on GitHub. ### 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 I have 2 x 27 display port screens connected to my m1 Mac mini. One connect via cdmi adapter one into a usb adapter. Functionality worked fine until beta 8 of Monterey so I switched to this great app. It works well except my left hand (usb to display port) screen at 'full brightness' is only at 1/2 brightness compared to the other screen. ### Steps to reproduce connect two screen to the mini, one via usb adapted one via cdmi adapter. ### Expected behavior both screens to be the same brightness ### Anything else? _No response_ ### Environment Information (please complete the following information) ```markdown - macOS version: Monterey RC2 - Mac model: Mini M1 - MonitorControl version:4.0.0 - Monitor(s):2x displayport - Apple Silicon/M1 (yes or no): yes ```

gitea-mirror

2026-05-05 06:06:32 -06:00

closed this issue
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gitea-mirror commented

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

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@waydabber commented on GitHub (Oct 22, 2021):

Hi @danwilderspin - it is not possible to use DDC via the HDMI port of the M1 mac mini, but via the USB-C port it is possible and is probably happening. DDC control allows for the hardware control of the backlight of the display. To make the two displays work uniformly, you can disable DDC brightness control on the display connected via USB-C. To do that, you have to unclick Use hardware DDC control under the Displays tab for that display, so the Control method will be the same for both displays.

Let me know if this helps! Thank you!

@waydabber commented on GitHub (Oct 22, 2021): Hi @danwilderspin - it is not possible to use DDC via the HDMI port of the M1 mac mini, but via the USB-C port it is possible and is probably happening. DDC control allows for the hardware control of the backlight of the display. To make the two displays work uniformly, you can disable DDC brightness control on the display connected via USB-C. To do that, you have to _unclick_ `Use hardware DDC control` under the Displays tab for that display, so the `Control method` will be the same for both displays. <img width="798" alt="Screen Shot 2021-10-22 at 13 07 26" src="https://user-images.githubusercontent.com/37590873/138444085-4a030d59-ef8e-4e7e-a338-07ae347fe093.png"> Let me know if this helps! Thank you!

gitea-mirror commented

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

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Owner

@waydabber commented on GitHub (Oct 22, 2021):

Hey, I'll close this issue (will reopen it if anything comes up that needs fixing in the app) but please let me know anyway if this fixes the problem or if I can assist you any way. Thank you!

@waydabber commented on GitHub (Oct 22, 2021): Hey, I'll close this issue (will reopen it if anything comes up that needs fixing in the app) but please let me know anyway if this fixes the problem or if I can assist you any way. Thank you!