That, again.

SWMBO has requisitioned one of my two monitors, so the docking station just has a single 1920x1200 display attached now.

The only quirk in the entire set-up is with the HDMI switch I use to share that single display among five different machines. This switch does not maintain an emulated connection when "switched away", so the XPS 13 behaves as if the display is unplugged, and switches back to the 1080p screen of the notebook itself.

So when I switch away from the XPS 13 to another machine, and then later switch back again, the bottom 120 lines of the screen are sometimes in a "confused" state. This happens often enough that I have added a simple launcher icon onto the desktop panel, to run this script which fixes it with a single mouse click:

Code:

#!/bin/bash
## The Dell WD15 docking station often gets confused
## when unplugging/plugging the notebook, and sometimes
## ends up with corruption at bottom of screen.
## Fix it by switching modes and then switching back again:

xrandr --output DP-1-1 --mode 1920x1080
xrandr --output DP-1-1 --mode 1920x1200

Problem solved.