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User profile for user: philipm_m1_user
philipm_m1_user Author
User level: Level 1
5 points

Issue with Belkin Thunderbolt 3 Dock Pro (M1 mac and Big Sur)

I am encountering a very similar issue to @t4ggs in this thread - https://discussions.apple.com/thread/252228453 I have a new MacBook Pro with the M1 chip and a Belkin Thunderbolt 3 docking station. I updated my OS today to Big Sur 11.2.2


I can connect my MacBook to the docking station. I can connect an external monitor using one of the Thunderbolt 3 / USB-C ports, with a uniAccessories USB-C to HDMI cable.


However when I try to connect to an external monitor using a Ugreen DisplayPort to HDMI cable, there is no display. I get a message on the monitor saying "Out of Range". I spent quite a bit of time searching for a solution. For example, I changed the scale / screen resolution and the Refresh Rate but this did not have any effect.


The Belkin Thunderbolt 3 docking station says macOS compatible on the box. It seems reasonable to me to expect that all of the ports should be usable. Being limited to one external monitor via the Thunderbolt port is the only workaround I have been able to identify. It would be really nice to be able to plug in two external monitors, as I was able to do on my old workstation.

MacBook Pro 13″, macOS 11.2

Posted on Mar 1, 2021 8:33 AM

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User profile for user: neuroanatomist
neuroanatomist
User level: Level 9
50,185 points

Mar 1, 2021 8:46 AM in response to philipm_m1_user

It would be really nice to be able to plug in two external monitors, as I was able to do on my old workstation.

The M1 Mac notebooks support only a single external display – up to 6K resolution, but only one. The limitation is not the dock or its compatibility, it's that your old Mac supported multiple external displays (13" Intel MBPs can drive two, 15/16" Intel MBPs can drive four), whereas your new Mac only supports one.


Check the specs for video support: "One external display with up to 6K resolution at 60Hz."


If you want more than one, you'll need to look into a DisplayLink adapter or dock (a hardware/software combination that allows >1 display on an M1 Mac, but it's not hardware accelerated, can be laggy, and can be borked by macOS updates requiring waiting a few weeks for updated drivers).

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Issue with Belkin Thunderbolt 3 Dock Pro (M1 mac and Big Sur)

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