xrandr output problem

[Hedvig Kamp <hedvig.ka@gmail.com>]

Hi,

I am running Debian stretch on a Dell Latitude E7470.

This is my output from xrandr, I expected to get information about
what outputs are available. My laptop is connected to another screen
(also Dell) though a docking station (HDMI).

hedkam@hopper:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
   1920x1080      0.00*

My guess so far is that it is a driver problem!?

What would you suggest is my next move?

Best,
Hedda