Hacker News Reader

This is a macOS issue. In my experience macOS handles DP much worse than windows. Windows will keep asking the device for its information, while macOS waits for the device to inform the OS. This can cause issues with monitor detection, as you're experiencing.

View on HN

Does macOS still not support DP-MST properly?

Properly? I thought not at all.

Apparently, if you connect two identical monitors to a mac via dp-mst, it will display the same image on both monitors.

I'm not sure if it's intentional, but it is at least giving an image.

Doesn't support on purpose, though on intel macs alternative OSes could use it.

DDC is also fraught with peril when you want to change settings from OS on non-Apple display.

Reply on news.ycombinator.com