M1 Mac does not support DDC/CI

Question

Created Jan ’21

Replies 6

Boosts 1

Views 10k

Participants 7

The DDC/CI application can work well on MacbookPro/Mac Pro (Big Sur), but it doesn't work on M1 Mac (both macOS 11.0.1 and 11.1). M1’s graphics card is Apple, not Intel or AMD. Does this incompatible issue relate with new graphics card or kernel change? Any alternative solution for M1?

Boost

Answer 1

swapnali01 OP

Feb ’21

To run the Cl application on M1 Mac, your targets should support bot the architecture Arm and X86.
check this

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Answer 2

Steve4442 OP

May ’21

Please disregard swapnali01's unhelpful answer which has nothing to do with the issue.

All Intel macs supported DDC/CI, both with AMD and Intel GPUs (or even nVidia when that was available). The lack of DDC/CI support breaks several popular third party utilities (like MonitorControl or Lunar.fyi and others) designed to control the brightness and volume level of most modern external displays. It also breaks and cripples apps designed by display manufacturers specifically for Macs to control external displays (like BenQ's Display Pilot or LG's Screen Manager).

For more information on the issue:

https://github.com/kfix/ddcctl/issues/86
https://github.com/MonitorControl/MonitorControl/issues/323
https://github.com/alin23/Lunar/issues/210#issuecomment-752405561

The arbitrary way Apple sometimes just leaves out important features from its products is alarming. It hurts the ecosystem, creates confusion and uncertainty. 6 months has passed since M1 was introduced and still there is no resolution to this issue. But the missing DDC/CI implementation is just the tip of the iceberg, external display support is still a mess in general (user forums are full of complaints about resolution issues, washed out colors - M1 Macs switch to limited RGB range for no good reason - on LG displays via DisplayPort over USB-C, broken HDR support etc). It's a shame!

7

Answer 3

Steve4442 OP

Jul ’21

Finally, the problem is now solved, DDC/CI control is now possible for M1 Macs (except through the M1 Mac Mini's HDMI port which seems to have the same problem in this regard as the 2018 Mac Mini's HDMI port).

See the developments here:

https://github.com/alin23/Lunar/issues/210 https://github.com/MonitorControl/MonitorControl/issues/323

:)

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Answer 4

mmaarriioo OP

Dec ’21

Problem is still not solved with Mac Mini M1 (Big Sur, 11.6) and USB-C/Thunderbold

1

Answer 5

KGF OP

Oct ’22

Finally DDC/CI works on my Mac Mini M1 2020 OSX 12.6.

All I did was replace the HDMI-to-HDMI with USB C-to-HDMI cable . (No adapter was tested. I have Acer 4k 60hz monitor with HDMI and DP ports, so not sure about the functionality with other monitors.)

Now, I can control external monitor from mac osx.

Use: https://github.com/MonitorControl/MonitorControl

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Answer 6

siddharth176 OP

Jan ’23

This app worked well for me, was able to control brightness of my LG and Dell monitor: https://displaybuddy.app

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