U2719D, multi screen framerate and resolution problem

Question

Hello,I am using 2 Dell U2719D screens with laptop Lenovo P43S which has integrated GPU Intel UHD Graphics 620. I am having trouble with using both of the monitors as one is having a huge drop in frame rate and resolution cannot be set more than a certain value. I tried with C type to docking station and than connect both monitors to docking station with Display port. I also tried to use daisy chain with C type to the first monitor and displayport between the first and second monitor. None of the options worked for me. I can use my laptop with other monitors without any problems with multiscreen. Thank you for your help.

jphughan · Accepted Answer

@molder  A laptop with an Intel 620 would not be able to send enough video bandwidth through a regular USB-C dock to run dual 2560x1440 60 Hz. You can run either dual displays up to 1920x1200, or a single display up to 2560x1440 with only enough bandwidth left over for some compromised resolution/refresh rate setup for a second display. If you want to run dual U2719D displays from that system, you need to do one of these things: Get a Thunderbolt 3 dock, which with your system will be able to tap into 4x more video bandwidth, enough to run dual 4K 60 Hz or triple 1440p. Note that only one of the system’s two USB-C ports supports Thunderbolt. Connect one of the displays directly to the system so that the second display’s bandwidth requirements don’t have to be met over the connection to the USB-C dock. Use an HDMI cable or a USB-C to DP cable.

molder · Answer

Thanks a lot for your rapid response.Two quesions: Would this docking station be sufficient for me ? https://www.lenovo.com/us/en/accessories-and-monitors/docking/universal-cable-docks-usb/TP-Hybrid-USB-C-Dock-US/p/40AF0135US When I connect two monitors: one through the hdmi, other through the usb-c, it doesnt send signals to hmdi. Therefore only one monitor is showing up. Thanks again.

jphughan · Answer

@molder Happy to help. In terms of your follow-up questions, the Hybrid dock uses “indirect display” technology called DisplayLink — not to be confused with DisplayPort — rather than tapping into native GPU interfaces as most docks do. The Hybrid dock’s reliance on DisplayLink means it would actually work for your display setup, but DisplayLink comes with some drawbacks that can be significant in some use cases, which I wrote about in the post marked as the answer in this thread. The Thunderbolt dock you’d want is this one.

In terms of using the dock and HDMI simultaneously, did you switch your display over to its HDM input if you had been using DisplayPort before? I suppose it’s possible that the system won’t allow you to use USB-C ports and the HDMI output for displays simultaneously, but that would be pretty unexpected. But if that limitation exists, you might find that a USB-C to DP cable would work since in that case both displays would be running from the system’s USB-C ports.

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U2719D, multi screen framerate and resolution problem

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