Connect 3 external monitors to WD19

Thank you! We have received the required details. We will work towards a resolution. In the meantime, you may also receive assistance or suggestions from the community members.

@Rafcio1991  There are two significant problems here.

First, the Intel GPU in that system only supports three total displays, no matter how they're attached.  Intel GPUs didn't support four total displays until the new Xe GPU, but that isn't available in your CPU.  The only way to exceed GPU limits on maximum displays is to drive additional displays via "indirect display" technology called DisplayLink -- not to be confused with DisplayPort.  There are single display DisplayLink USB adapters, but DisplayLink comes with a lot of drawbacks that can be significant in some use cases.  I wrote about them in the post marked as the answer in this thread.

The second problem is that the total bandwidth requirements of the displays you're connecting to that dock is far higher than the video bandwidth available between your system and the dock.  The Latitude 7410 is a DisplayPort HBR2 system, which means you have enough bandwidth to run EITHER that 3440x1440 display, OR dual displays up to 1920x1200 each.  You can't run all three of those at once.

So in terms of options, in order to deal with the GPU limit on maximum displays, you'll either have to use DisplayLink or plan not to use the laptop's built-in display so that you can use three external displays.  If you go the DisplayLink route, then the fact that DisplayLink data is sent as regular USB data rather than native GPU traffic means that the display driven by DisplayLink wouldn't count against your GPU bandwidth.  But I don't think single display DisplayLink adapters support 3440x1440, and running one of the 1920x1080/1200 displays via DisplayLink wouldn't free up enough bandwidth to allow the remaining two to be driven together.

So to deal with the bandwidth requirement, you have two options.  One would be to replace your WD19 regular USB-C dock with a Thunderbolt dock like the WD19TB (or TBS), which when paired with your system can tap into 4x more video bandwidth than the regular WD19.  It would run your desired display setup, although you might have to connect one of the displays to the downstream TB3 port at the edge of the dock, using something like a USB-C to DP cable.  (This port doesn't exist on the regular WD19.)  The other option would be to connect the 3440x1440 display to the HDMI 2.0 port built into the Latitude 7410 itself so that its bandwidth requirements don't have to be met over the dock connection.

Hi,

I have tried option 2 to connect  3440x1440 displey with HDMI to HDMI at build port in Lattitude, unfortunatetly display is displaying " No HDMI signal from your device"

DELL and IIYAMA are connected with DP at docking station.

Hi @jphughan ,

I got WD19TBS  station, but when I'm trying connect 2 monitors with DP to station and 1 to HDMI in laptop then at display setting I can see 4 monitors, but 1 of them is not displaying( it gets grayed out)

@Rafcio1991  Yes, that is normal for your system.  I explained the problem in my first reply here.  The Intel GPU built into the Latitude 7410 only supports three total displays, regardless of how they're connected.  Intel GPUs didn't support four displays until the Intel Xe GPU, but that didn't arrive until the Core 11th Gen CPUs, which arrived in the Latitude 7420.  To run more than three displays from your system, at least one of them would need to be connected via DisplayLink.  But that has drawbacks that I wrote about in a thread I already linked in that earlier reply.

The maximum display limit is separate from and in addition to any bandwidth limits that may apply to your intended display setup.

@@jphughan

Yes, but you also mentioned that one of the solution would be  to connect the 3440x1440 display to  the HDMI 2.0 port built into the Latitude 7410 itself so that its bandwidth requirements don't have to be met over the dock connection.

It aslo is disabling one of the Displays.

So right now only option for me is to get 4th monitor connected with Displaylink? And how to do that?

Or try to connect it with DP/USD-C into TB3 in side port?

I have a Dell XPS 15 9500 (Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz 2.59 GHz) and I recently bought a WD22TB4 thunderbolt dock. I am trying to connect 3 external monitors and use my laptop screen as well. I am running into a similar problem where I can only run 3 of the 4 at a time. I also tried connecting my 3rd monitor with a usb-c to HDMI adapter directly to a second usb-c port on my laptop and the usb-c port on the dock but still run into the problem with 3 monitors only working. Is it possible to have all 4 screens working with this laptop and dock combination?