RE: Dual U2515H, D1000 Docking Station, Cables?
You will not be able to get the U2515H maximum resolution 2560x1440 60Hz. The D1000 maximum using two of its video out ports is 2048x1152 60Hz.
The D1000 has VGA/HDMI/DP out ports. You will need to purchase an HDMI to HDMI cable.
XPS Laptop USB 3.0 port --> D1000 USB 3.0 cable --> D1000
D1000 DP out --> U2515H DP to mDP cable --> 1st U2515H mDP in
D1000 HDMI out --> HDMI to HDMI cable --> 2nd U2515H HDMI in
Social Media Support
Run the PC pre-Windows diagnostics
Run the Monitor Reset & BID (Built-in Diagnostics)
Out of Warranty Support