Hello! I have a Dell Precision 5510 which is connected to a Dell WD15 dock via USB-C. The dock is connected to a Dell U2715H monitor via mDP, which is also daisy chained to another U2715H. The problem I'm having is that only the monitor connected to the dock has a resolution of 2560 x 1440 while the monitor that is daisy chained has a resolution of 1920 x 1080. Upon looking through the manuals for both the precision and the dock, I should have the capability for max resolution on both of these monitors. However, I'm not sure what I'm missing. Some help would be greatly appreciated.
According to page 30, the WD15 supports two FHD or WUXGA monitors at 1920x1080 at 60Hz. Or a single UHD 4k2k monitor at 3840x2160 at 30Hz.
What the User's Guide does not discuss is the WD15 dock capabilities when using its mDP out port and driving daisy chained monitors. You may just be at the maximum that it can push.
Take the dock out of the troubleshooting and test the capabilities of the laptop itself =
Precision 5510 USB-C out port --> USB Type-C to DP cable --> #1 U2715H DP in port (DP 1.2 Enable)
#1 U2715H DP out port --> U2715H DP to mDP cable --> #2 U2715H mDP in port (DP 1.2 Disable)
If you get the same resolution restrictions, then that shows that the laptop is the limiter, not the dock.
I guess I must've been looking at an incorrect manual for my particular dock. I can't test if the laptop would be a limiter as I don't have the necessary part on hand, but I doubt it would be an issue because mDP and regular DP have the same capabilities. I guess I have to upgrade to a dock along the lines of TB16. Thanks for the help.
See this TB16 article. It mentions the Precision 15 5510 as compatible and shows 2560 x 1440 in the chart.