M1Pro (MBP 2021, 16inch) - Detects only one External monitor

Argo · 07-27-2022, 10:23 PM

Hi There,

I have a M1 Pro (MBP 16inch) with OS 12.4 and content is mirrored across both the external monitors. It used to work before!

The dock is the Dell WD22TB4 (https://www.dell.com/en-us/work/shop...pc-accessories)

I have tried to use a separate Intel based MBP with the recent most DisplayLink updated, and the results are the same.

The only way I could use both my external monitors is if I hard wire an HDMI and a Thunderbolt between my 2021 MBP and the external displays.

I tried to run the Display Link debug tool (log collector) and I can see that the system detects only the MBP display and ONE of the TWO external displays. This is also what MBP detects in my display settings.

Please advise!

07-27-2022, 10:23 PM	#1
Argo Junior Member Join Date: Jul 2022 Posts: 1	M1Pro (MBP 2021, 16inch) - Detects only one External monitor Hi There, I have a M1 Pro (MBP 16inch) with OS 12.4 and content is mirrored across both the external monitors. It used to work before! The dock is the Dell WD22TB4 (https://www.dell.com/en-us/work/shop...pc-accessories) I have tried to use a separate Intel based MBP with the recent most DisplayLink updated, and the results are the same. The only way I could use both my external monitors is if I hard wire an HDMI and a Thunderbolt between my 2021 MBP and the external displays. I tried to run the Display Link debug tool (log collector) and I can see that the system detects only the MBP display and ONE of the TWO external displays. This is also what MBP detects in my display settings. Please advise!