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ZBook 15 G2 supporting 4K DisplayPort over dock

Zbook 15 G2
Microsoft Windows 10 (64-bit)

Hello,

 

I'm using ZBook 15 G2 with HSTNN-I11X dock with 200W adapter and try to connect 4K UHD display with DisplayPort. Connecting it dirrectly to laptop will work fine. Trough dock, I sometimes get the monotor working with 1080 resolution only (UHD monitor) and then it has short horistonal lines running accross the screen. I tried the same dock with 8570W and got the same result with the display only going up to 1080. Connecting the cable straight to the laptop DisplayPort and not using the dock will go to UHD resolution

 

Can someone confirm that the newer A7E34AA dock will support UHD resolution over DisplayPort?

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