03-06-2019 06:48 AM
I had a set up with a T480, an Ultra Dock, and three Dell U2518D.
These monitors have up to 2560x1440 pixels.
One is connected via DP, the other two do DP passthrough.
No, it worked for the last 8 month or so.
But recently, either after a Windows Update, or a Lenovo system Update, the third monitor can only do 2000x1080.
My try was getting rid of Daisy Chaining, so I switched the Monitor to HDMI connection, no solution.
Then I tried older graphics drivers, no solution.
So either a Windows Update (also drivers through there), or a Lenovo System Update (Driver or FW Update) broke the ability to to 3x 2560x1440.
This happened on 4 Laptops, two T480 i5 (intel only), one T480 i7 (intel only) and one T480 i7 (nVidia Hybrid).
Windows Version is 1803 for the ones withoug nVidia and 1809 for the one with nVidia.
As I tried dockings with the latest FW update, and without, the problem seems not on the docking side.