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What's DOS?
Posts: 1
Registered: ‎06-13-2019
Location: ZA
Views: 195
Message 1 of 3

Two 4 k displays with X280 and USB-C dock

Two indentical 28" 4 K sony displays, but I can only obtain a 4 k display on one Settings.JPG

Its really frustrating and I'm not sure if its a laptop or dock problem


Any help would be much appreciated





Punch Card
Posts: 8
Registered: ‎11-17-2011
Location: US
Views: 156
Message 2 of 3

Re: Two 4 k displays with X280 and USB-C dock

Check this page if you have USB-C Gen 2 dock


If you have a different one, check the others.

ThinkPad X280 | Intel Core i7-8650U | 12.5" FHD; IPS | 16GB DDR4 2400MHz | 480GB XPG M.2 SSD | Fingerprint | BT | Intel UHD 629 | Win 10 Pro x64
Lenovo Employee CandyZhao
Lenovo Employee
Posts: 10
Registered: ‎06-21-2019
Location: CN
Views: 106
Message 3 of 3

Re: Two 4 k displays with X280 and USB-C dock

Hi SThomson,


Not sure your dock is USB-C gen1 dock or USB-C gen2 dock. No matter USB-C gen1 or gen2 dock + X280, can't support two 4k display, it's not system or dock issue. It's work as design.


For dock detial resolution, you can check in below page. dock


If your X280 want to support two 4k display, suggest you to buy a Thunderbolt dock, X280 + below two Thunderbolt dock, can support two 4k 30hz display.

ThinkPad Thunderbolt 3 Dock Gen 2 (40AN, 40AN0135XX)

ThinkPad Thunderbolt 3 Dock (40AC, 40AC0135XX)


If you have any further question, please let me know.

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