MacBook Pro M1 doesn't support 3 HDMI connections

First thing to try is each display ALONE, to assure yourself that it works by itself.

You posted a link to the technical specifications more than once. I never saw that you claimed yours was an M1 MAX processor.

Display Support

Simultaneously supports full native resolution on the built-in display at 1 billion colors and:

• Up to TWO external displays with up to 6K resolution at 60Hz at over a billion colors (M1 Pro) or

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. When you connect a more modest display, less than 6K size, you do not get to add yet another display "because you did not use up the others." Two is the limit because there are only two free rasterizer/display-generator hardware inside the Pro model.

If you need more hardware-accelerated displays than the built-in and TWO external displays, 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.

Most of these are using DisplayLink drivers AND a DisplayLink stunt-box with special chips inside.

DisplayLink technology creates a "fake" display buffer in RAM, sends the data out over a slower interface to a stunt box with DisplayLink custom chips that put that data back onto a "legacy" interface. It is not a true "accelerated" display, and it can suffer from lagging. Just adding the DisplayLink Driver is not adequate to get a picture -- you need a DisplayLink "stunt-box" or a Dock that includes DisplayLink chips.

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It may be acceptable for a second display showing slow-to-change data such as computer program listings, stock quotes, or spreadsheets, but NOT for full motion Video, not for Video editing, and absolutely not for gaming. Mouse-tracking on that display can lag, and can make you feel queasy.

In a pinch, it may even play Internet videos (as one user put it) “without too many dropped frames".

If you are only doing program listing and stock quotes and other slow to change data, DisplayLink can work for you, but requires you to make some strong compromises.

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It is really nice to know that you can use a DisplayLink display if you MUST have an additional display for some of the types of data I mentioned. But that is NOT the same as the computer supporting a second, built-in, Hardware-accelerated display.

These displays depend on DisplayLink software, and are at the whim of Apple when they make MacOS changes. There have been cases where MacOS changes completely disabled DisplayLink software, and it took some time for them to recover.

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I think the Big Surprise for a lot of Hub/Dock buyers is that they thought they were getting a "real" display, but actually got a DisplayLink "fake" Display. If you got what you expected in every case, I would not use such pejorative terms to describe DisplayLink.

bhuvaneshm wrote:

It also says this, can you pls explain how to make 3 external displays to work?

Display Support

• Up to three external displays with up to 6K resolution and one external

display with up to 4K resolution at 60Hz at over a billion colors (M1

Max)

You have not told us which silicon chip you have (Pro or Max). The Pro supports up to 2 external displays and the max supports up to 3 external displays as clearly stated by the link in your initial post.

Which do you have? You keep repeating Silicon M1.

M1 Pro processor support

• Up to two external displays with up to 6K resolution at 60Hz at over a billion colors (M1 Pro) or

M1 MAX is a differtent processor. It was an Option when your 16-in MacBook Pro was built, but is NOT available as an upgrade.

• Up to three external displays with up to 6K resolution and one external display with up to 4K resolution at 60Hz at over a billion colors (M1 Max)

There is no solution that supports full-motion Video and video editing EXCEPT to buy a more capable computer.

IF and only IF you want to display only slow-to-change data such as spreadsheets, program listings, and stock quotes, you can buy a Dock device that supports DisplayLink software/hardware solutions.