User profile for user: Hallock27
Hallock27 Author
User level: Level 1
8 points

Ventura M1 Macbook Pro cannot see multiple Thunderbolt 2 Displays

Have a 2020 M1 MacBook Pro - trying to connect 2 legacy 27" Thunderbolt 2 Monitors daisy-chained through the same Thunderbolt 4 port.

Seems to work fine on my other 16" M1 MacBook Pro - Curious why not this 13"?

Monitors work fine independently. When connected, USB, sounds, etc all work fine, just no picture.

Appreciate the help.


HW Details:

    • Model Name: MacBook Pro
    • Model Identifier: MacBookPro17,1
    • Model Number: MYD82LL/A
    • Chip: Apple M1
    • Total Number of Cores: 8 (4 performance and 4 efficiency)
    • Memory: 8 GB
    • System Firmware Version: 8422.100.650
    • OS Loader Version: 8422.100.650

OS Details:

    • System Version: macOS 13.3.1 (a) (22E772610a)
    • Kernel Version: Darwin 22.4.0
    • Boot Volume: Macintosh SSD
    • Boot Mode: Normal


Display / Thunderbolt Details:

    • Thunderbolt Display:
    •   Vendor Name: Apple Inc.
    •   Device Name: Thunderbolt Display
    •   Mode: Thunderbolt
    •   Device ID: 0x8002
    •   Vendor ID: 0x1
    •   Device Revision: 0x1
    •   UID: 0x0001000100A3D470
    •   Route String: 1
    •   Firmware Version: 26.2
    •   Port (Upstream):
    •   Status: Device connected
    •   Link Status: 0x2
    •   Speed: Up to 10 Gb/s x2
    •   Port Micro Firmware Version: 2.0.7
    •   Cable Firmware Version: 0.1.18 / 0.0.0
    •   Cable Serial Number:
    •   Port:
    •   Status: Device connected
    •   Link Status: 0x2
    •   Speed: Up to 10 Gb/s x2
    •   Port Micro Firmware Version: 2.0.7
    •   Cable Firmware Version: 0.1.18


      • Thunderbolt Display:
      •   Vendor Name: Apple Inc.
      •   Device Name: Thunderbolt Display
      •   Mode: Thunderbolt
      •   Device ID: 0x8002
      •   Vendor ID: 0x1
      •   Device Revision: 0x1
      •   UID: 0x0001000100A58910
      •   Route String: 301
      •   Firmware Version: 26.2
      •   Port (Upstream):
      •   Status: Device connected
      •   Link Status: 0x2
      •   Speed: Up to 10 Gb/s x2
      •   Port Micro Firmware Version: 2.0.7
      •   Cable Firmware Version: 0.1.18
      •   Cable Serial Number:
      •   Port:
      •   Status: No device connected
      •   Link Status: 0x7
      •   Speed: Up to 10 Gb/s x2
      •   Port Micro Firmware Version: 2.0.7



|}!$€1P|_£_|\|\@C, MacBook Pro 13″

Posted on May 15, 2023 03:38 PM

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User profile for user: Grant Bennet-Alder
Grant Bennet-Alder
User level: Level 10
138,683 points

Posted on May 15, 2023 04:14 PM

Apple-Silicon 2020 M1 13-in MacBook Pro and Air and 2022 Apple-Silicon M2 13-in MacBook Pro and Air 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 fully Hardware-accelerated display can NOT be added to the entry-level 13-in M1 or M2 systems.

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Question marked as Top-ranking reply
User profile for user: Grant Bennet-Alder
Grant Bennet-Alder
User level: Level 10
138,683 points

May 15, 2023 04:14 PM in response to Hallock27

Apple-Silicon 2020 M1 13-in MacBook Pro and Air and 2022 Apple-Silicon M2 13-in MacBook Pro and Air 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 fully Hardware-accelerated display can NOT be added to the entry-level 13-in M1 or M2 systems.

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Ventura M1 Macbook Pro cannot see multiple Thunderbolt 2 Displays

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