We faced display issues with recent DELL laptops (for example Latitude 5480 or Latitude E7250) using 2 screens through a docking station.
The encountered symptoms (on Windows 7 or 10) are :
slowless when we move the windows
after a meeting, the laptop is reconnected on the docking station but the screens remain black, even if we disconnect / connect the docking station. We have to reboot the laptop to have the display back on the screens.
We tried the following tests, without success :
video drivers update and installation of other firmwares present on the DELL website
installation of the software "Dell Display Manager Application" : as the computer had performance issues since the software installation, it has been removed from the laptop