[NAME]  The fact that Dell makes a system that requires something doesn't mean that every accessory they make will support the requirements of that system.  It also works the other way.  For example, Dell makes displays that use Thunderbolt for full functionality, and they also make systems that don't support Thunderbolt, which wouldn't be able to use that display to its maximum potential.  (That said, I do find it a bit strange that the first XPS 15 to run 130W over USB-C was introduced in late 2015, and here we are in late 2021, and Dell still hasn't made any USB-C display that provides 130W.)In terms of your options, they are correct.  In terms of the questions:To check power, go into the BIOS Setup and check either the system summary or battery information section.  One of those areas should show the identified wattage of the attached power source.In the dock scenario, you could use either the USB-C or downstream TB3 port to connect the U2722DE.  Or you could use a regular DP cable for video and also connect a USB-C to USB-A cable for USB 3.x data (USB-C side plugged into the USB-C input on the display, USB-A side connected to the WD19TB).  That cable should have been included with the U2722DE.In terms of resolution, first of all I realized I made a mistake earlier.  I thought the U2715H was a 1080p display, because these days Dell uses "H" for 1080p and "D" for QHD.  But I'd forgotten that back in the days of the U2715H, they used "H" for 16:9 displays in general, including those with QHD.  So your bandwidth situation was even worse than I realized in the USB-C scenario!  Anyway, the dock's DP outputs only support DP 1.4 if the source system does.  But that's not an issue because you don't need DP 1.4 for your display setup.  A single full DP 1.2 interface is enough to run 4K 60 Hz, in fact a single interface can run dual QHD on its own.  The problem in your USB-C setup is that you only have half of a DP 1.2 interface since you're also running USB 3.x.  But when your system is using Thunderbolt, it can run two full DP 1.2 interfaces and USB 3.x all simultaneously.  So yes, you'll have enough bandwidth for dual QHD, in fact you'd have enough for triple QHD or dual 4K 60 Hz.Good luck!
Hello, I have a XPS15 9500, a Dell U2722DE and an older Dell U2715H. Setup: - XPS (USB-C) to U2722DE (USB-C) - U2722DE (DP out) to U2715H (DP in) - The laptop is charging through the same USB-C - Keyboard and mouse are connected to U2722DE via USB - Headphones are connected to U2722DE via jack - Ethernet is connected to U2722DE Everything is working fine except for the resolution of the U2715H. Fonts are blurred. I guess it has something to do with the resolution and the refresh rate. The input seems to be 1920/1080 (30Hz) instead of 2560/1440 (60Hz). See attached print screen. I looked into menus of both monitors but nothing seems to rectify the issue. What is the problem? Thank you for the support!    [IMAGE]
Chain Multiple Monitors