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Mercedes C.
5 days ago
AskAnything

USB C works for an external monitor when connected through a hub but not directly??

I’m having a strange issue with my portable monitor:

  1. Connecting the monitor directly to my laptop’s USB-C port → it does not work.

  2. Connecting the same monitor using the same USB-C cable through a USB-C hub (from the exact same laptop USB-C port) → it works perfectly.

  3. The hub is not connected to external power.

  4. This exact monitor worked with a previous laptop with the same C-to-C cable.

When I initially couldn't use this port directly, I chalked it up to having a non-display support USB-C port... But now it workks through a hub?!!?

Does anyone know why this happens? Is the hub changing the USB-C negotiation, enabling DisplayPort Alt Mode differently, or is there some compatibility issue between the laptop and monitor?

Would appreciate any insights from people familiar with USB-C/DisplayPort Alt Mode! 🙏

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