Resolution problems with WD15 Dock and 3 monitors

Question

I've got a Precision 5510 Laptop with Windows 7 and a WD15 dock. The laptop BIOS, and dock firmware and drivers are up to date. I've got 3 ASUS monitors connected as follows: Monitor DVI to dock mini-display via adapter Monitor VGA to dock VGA Monitor HDMI to dock HDMI The desktop is extended to use all 3 and not use the built in display. The resolution on the first 2 is great, 1920x1080 @ 60p Hz. The HDMI connection only allows me 720x576 @ 50p HZ. All the troubleshooting docs I found tell you to expect with 2 monitors and that 4 monitors are not supported.  Nothing about 3 monitors. Is this expected behavior? -jp

robert p · Answer

Hi Jpesenti, Thanks for posting. Here is some information you may find helpful.

JPesenti · Answer

Thanks for that info, Robert P.

So I have the USB Type-C cable with my WD15. And this says that triple display allows 3x SXGA (1280 x 1024 @ 60 Hz).

Any thoughts as to why my HDMI connected monitor is only allowing me 720x576 @ 50p HZ? Is it because the other 2 are set to 1920x1080 @ 60p Hz?

samos1111 · Answer

Did you test reducing the frequency of the first two monitors to 30Hz or also reducing their resolution?

I'm not sure, but the bandwidth of the WD15 USB3.1 connection (10Gbps) might be saturated - mind it surely does not support a single 4K@60Hz, but it does 4K@30Hz.

Does the setup work if you connect the third display directly to the laptop?

The TB16 dock connects via TB3 (40Gbps) which allows two 4k@60Hz displays plus some headroom left.

jinlong.ye · Answer

I'm having the same problem as you. Our older format dock supports 3 monitors at 1080p no problem.

The weird part is that I can have 2 x 1080p external monitor and the built-in laptop screen at 1080p but not 3 x 1080p monitor.

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