Mac doesn't recognize DisplayPort cable when plugged into USB-C

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Mac doesn't recognize DisplayPort cable when plugged into USB-C

I have a Macbook M1 2020 13-Inch. Currently on Sonoma 14.5. It has two USB-C ports. I use one for my charger, and the other one for my usb hub. A few days ago, I got a new monitor with a DisplayPort cable. There is a port for it on my usb hub, but when I plug it in, my mac receives no signal and doesn't recognize it. However, when I use a DisplayPort adapter, it DOES connect. I don't understand why exactly so yeah if someone could help me with connecting it via my usb hub that would be awesome! Thank you!

Not advertising this, these are the things I use:

Usb hub:
DisplayPort adapter:

Apple please don't delete my question again bc last time it just disappeared.

Thanks a lot!!

[Edited by Moderator]

MacBook Pro 13″, macOS 14.5

Posted on Jul 24, 2024 12:43 PM

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Answer 1

Jul 24, 2024 5:46 PM in response to SirJust96

The Mac does not rely on windows-like side-loaded "Drivers" which are actually packages of resolutions and settings for a specific display. Instead, it goes straight to the immutable source -- it asks the display itself.

To get a Mac display to become active, you need the Mac to query the display, and the display to answer with its name and capabilities. Otherwise, the display will not be shown as present, and no data will be sent to the display. "No signal detected" is generated by the DISPLAY, not by the Mac.

This query is only sent at certain times:

• at startup

• at wake from sleep — so momentarily sleeping and waking your Mac may work

• at insertion of the Mac-end of the display-cable, provided everything on that cable is ready-to-go

• hold the Option key while you click on the (Detect Display) button that will appear in Displays preferences (from another display)

so try doing some of those things and see if the display comes alive.

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Mac doesn't recognize DisplayPort cable when plugged into USB-C

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