I have a Dell Precision 7760 with a WD19DCS dock running windows 10. I believe I have all the latest drivers and both Dell Command Update and SupportAssist agree. I would like to connect two ASUS VL249HE monitors running at 1920x1080 to the dock. This should be well within the specified limits. The monitors only have HDMI and VGA connections and the dock only has one HDMI port. For the second monitor I am using a Dell DisplayPort to HDMI 2.0 4k adapter, model # DANAUBC087. When I connect the second display to the DisplayPort on the dock Windows Settings -> Display correctly reports the monitor and I can move my mouse into the extended display area; however, the monitor itself is completely dark. If I remove the adapter and connect the HDMI cable to the HDMI port on the back of the laptop it works as expected. I have also tried connecting a Dell P2317H monitor with an HDMI cable and adapter and seen the same no display issue. Finally I have also tried swapping out the WD19DCS dock for an old TB16 Thunderbolt dock in that case the HDMI cable with DisplayPort adapter works as expected. Given that I can drive the two monitors through the TB16 I strongly suspect a defect in the WD19DCS driver.