Compiled list of known working DDC/CI docks for macos? #1826

I want to add that supposedly according to pluggable, their ts3 and ts4 docks are supposed to work, but when I tried it myself on the ts3 they did not.

So I finally put together a setup and was able to get some datapoints on a few products. My setup is two identical acer dvi monitors. I know DVI is rare these days but maybe it will help someone

Working DDC/ CI

Cable Matters USB C to DVI Adapter

UGREEN Thunderbolt 4 Dock 13-in-1 40Gbps Docking Station

Their own support staff told me that they had no docks that supported DDC/CI which I found unlikely, and since it was on sale I gave it a shot and sure enough, the dock works perfectly and does not cut off the DDC signals. The dock only has one display port out but I was able to connect a usbc -> dvi adapter and both outputs passed on the DDC signals correctly.

Non working DDC/ CI

I plugged the below directly into a mbp m2 pro and was unable to control my monitors

BENFEI USB C to DVI Adapter
BENFEI USB C to DVI Cable, 1.8 Meter Type-C

Non working display clown car setup

I had a working DDC/ CI setup before

Intel Mac -> EGPU -> DP to DVI -> Monitor 

I thought if it works, maybe I could put a thunderbolt/ usb c adapter in front of that and things should still work.
I had a working DDC/ CI setup before

Silicon Mac -> usbc to DP adapter -> DP to DVI -> Monitor 

But no matter which brand of usb c -> dp female adapter I got, it would not work. Not even basic image, disregarding DDC/CI
https://www.amazon.com/dp/B08QV2FSKT
https://www.amazon.com/dp/B0FK5L7Z3H?th=1

I would like to add on to this list, as I've had a difficult time finding a lower-priced USB-C hub or docking station that provides DDC support.

Old working setup: M1 MacBook Air, HP P27h G4 monitor, MonitorControl app, and Anker 341 USB-C hub.

I wanted a USB-C hub or docking station with ethernet port and other requirements, so I recently I tried:

1. Anker 555 USB-C hub
2. Anker 565 USB-C hub
3. Anker 575 USB-C docking station
4. Acer ODK370 (13-in-1) USB-C docking station
5. Plugable TBT4-UD5 docking station

Anker 565 USB-C hub and Plugable TBT4-UD5 had DDC support.

New working setup: M1 MacBook Air, HP P27h G4 monitor, BetterDisplay app, and Plugable TBT4-UD5 docking station.

Notes:

1. My M1 MacBook Air is running Tahoe 26.6.1. I read that for some users, DDC suddenly stopped working when they updated their devices (a year or more ago).
2. Not all Plugable hubs or docking stations have DDC support (for MacOS?) as the chipsets vary. I double checked that the Plugable TBT4-UD5 docking station didn't use DisplayLink.

UGREEN U715 / Revodok Max 2131 TB5 — dual DDC/CI workaround on macOS

Tested with:

• Apple Silicon MacBook Pro
• UGREEN U715 / Revodok Max 2131 Thunderbolt 5
• 2× LG 27GP850-B
• MonitorControl, BetterDisplay and m1ddc

Results:

• 2× USB-C → DisplayPort: both monitors work, but hardware DDC/CI brightness works on only ONE monitor.
• USB-C → DisplayPort + USB-C → HDMI: hardware DDC/CI works perfectly on BOTH monitors independently.

I tested identical DP cables, different TB5 ports, cable swapping, power cycling, and even disconnecting the working monitor. 2× DP never gave me DDC on both displays.

Final working setup:

MacBook → U715 → USB-C→DP + USB-C→HDMI → 2× LG 27GP850-B

Both displays run at 2560×1440 @ 120 Hz with real hardware/backlight brightness control — no software dimming.

So the U715 does support dual-monitor DDC/CI on macOS, but in my setup it is connection-topology dependent.

Keywords for anyone searching: UGREEN U715 DDC not working, Revodok Max 2131 DDC/CI, Mac dual monitor brightness, Thunderbolt dock DDC, DDC works only on one monitor.