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05-01-2020

GB

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Lenovo USB-C Mini Dock 4k60hz?

2020-05-21, 21:40 PM

I have purchased Lenovo USB-C Mini Dock and connecting my Thinkpad t470s i can only get 4k@30hz through the hdmi connection to my 4k monitor. 
 

I use the same hdmi cable/monitor to connect my desktop with gtx 970 and can get 4k60hz so it would seem issue is with dock or laptop.

 

could someone please explain why this is not working as advertised?

 

thanks

 

this is the dock in question:

https://download.lenovo.com/consumer/options/lenovo_usb-c_mini_dock_qsg.pdf

 

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277 Posts

06-26-2016

DE

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Re:Lenovo USB-C Mini Dock 4k60hz?

2020-05-22, 11:27 AM

 

because only 2 of the 4 lanes available in USB-C  are selected for video transfer between system and dock.  The other 2 lanes are used for USB data to drive the usb ports, ethernet, audio  on the mini dock.

 

If your system were supporting DP1.4 you would still be able to use 4K@60hz, if the dock is supporting DP1.4.  But the T470s is a DP1.2 system. With only 50% bandwidth available 4K@30Hz is all you'll get.

 

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