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Why can't I enable MST (daisy chain) function in Extend Mode on my MacBook?

05-28-2019

If Mac/MacBook with Mac OS is connected to monitors with Thunderbolt 3 to DisplayPort cable, MST (daisy chain) function can only be enabled in "Mirror Mode".

 

MST (daisy chain) function can be enabled in both Extend and Mirror modes with below conditions:

 



Device OS Cable for Device-Monitor Connection Extend Mode Mirror Mode
Device
PC/NB
OS
Windows OS
Cable for Device-Monitor Connection
DisplayPort cable
Extend Mode
✔
Mirror Mode
✔
Device
Mac/ Macbook
OS
Windows OS
Cable for Device-Monitor Connection
Thunderbolt 3 DisplayPort cable
Extend Mode
✔
Mirror Mode
✔
Device
Mac/ Macbook
OS
Mac OS
Cable for Device-Monitor Connection
Thunderbolt 3 DisplayPort cable
Extend Mode
 
Mirror Mode
✔

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