Macbook Pro 2020 Dual Monitor Setup

samkelly1999 Said:

"Macbook Pro 2020 Dual Monitor Setup: Trying to do a dual monitor set up with my Macbook Pro however only one monitor is being detected. Both monitors are plugged via seperate lightning ports and are detected if I pull either one out. i.e. Monitor A is detected when only monitor A is plugged in, Monitor B is deteced when only B is plugged in, but only Monitor A is detected when both monitors are plugged in. Does anyone know a way to fix this?"

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Based on personal experience...

Getting Multiple Displays:

The J5 USB-C Dual HDMI Docking Station allows for more than two extra monitors. How so? Well, plug in a display projector the Mac using the USB-C Digital AV Multiport Adapter and then plug the J5 hub with 2 HDMI displays (one 4K), and then you'll have 3 external screens. It all mirrors and extends. This works my Intel and Silicon Macs.

Apple-Silicon 2020 M1 13-in MacBook Pro and Air and 2022 Apple-Silicon M2 13-in MacBook Pro and Air and the 2023 MacBook Air 15-in model are extremely-capable entry-level computers. They can support the internal display AND an External display up to the previously unheard of size of the Apple 6K display at billions of colors. But only ONE in addition to the internal display.

This may not match the way older computers forced you to work, since older computers were not able to support a really large external display. But it is NOT a defect. The spec was available long before you could purchase the computer.

The Apple standard for its built-in hardware-accelerated displays, makes them suitable for full-motion video for production/display of cinema-quality video with NO dropped frames, and NO dropouts or partial-blank scan lines due to memory under-runs or other issues. This requires a hardware rasterizer/display-generator for each fully-accelerated display.

If you need more hardware-accelerated displays than the built-in and ONE external display, and an un-accelerated iPad if desired, you probably need a more capable computer.

If you are only doing program listings, spreadsheets, stock quotes and other slow to change data, there are some other solutions, but they require you to make some strong compromises.

Executive summary: More than ONE additional Hardware-accelerated display can NOT be added to the entry-level 13-in or 15-in M1 or M2 systems.

samkelly1999 wrote:

Trying to do a dual monitor set up with my Macbook Pro however only one monitor is being detected. Both monitors are plugged via seperate lightning ports and are detected if I pull either one out.

i.e. Monitor A is detected when only monitor A is plugged in, Monitor B is deteced when only B is plugged in, but only Monitor A is detected when both monitors are plugged in.

Does anyone know a way to fix this?

Exactly what make/model/year/chip is this Mac? Different models have different specifications for external display support.