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  • Posts: 136
  • Registered: ‎05-14-2014
  • Location: Canada
  • Views: 934
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Thunderbolt 3 (40AC) corner flickering issues w/ X1 Carbon (20X4001XUS)

2019-08-19, 21:36 PM

Hey Lenovo community,


I have a very unusual problem occurring on an external ThinkVision Pro2820 monitor that is connected to a Thunderbolt 3 Dock from an X1 Carbon (20X4001XUS). It flashes like it is on the top left corner in the picture I have attached every 20-40 seconds.


It does it matter if browsers are open or not. We have tried all of the following:


- updated Windows 10

- updated drivers

- updated firmware on PC and dock

- reinstalled Windows 10

- replaced monitor with a different one.

- replaced dock with one of same model.

- tried different video ports on the dock (VGA, Displayport)

- this issue DOES NOT occur while working in Linux.

- on this workstation (X1 carbon) there is no problem when connecting the 4k USB-C monitors at the house.


This issue is ONLY limited to when going through the dock.


We have recently run the firmware for the dock and it has made no difference.


Any thoughts before we look into a possible warranty claim?

Thanks in advance, Lenovo Community?

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