DisplayLink external monitor and xcalib software

[Jan Hubený]

Hello,

I was used to use the "invert" ability of xcalib util on my previous hw configuration (laptop with traditional docking station).
Command
xcalib -a -i
inverted the colors on monitor (either on internal panel or on external monitor).

On my current configuration (Dell Vostro 5590 + Del6000 doscking station + one external monitor) the xcalib -a -i command inverts the colors only on internal panel. It cannot change the colors on external monitor (I have also no success with -d and -s command line parameters).

Does anybody know how to use it or How to invert colors completely in the gnome 3 desktop environment ?

There are several extensions which works, but they change only colors of one active window:
https://extensions.gnome.org/extension/1041/invert-window-color/
https://extensions.gnome.org/extension/3530/true-color-invert/
https://extensions.gnome.org/extension/1819/invert-window-color-preserving-hue/
https://extensions.gnome.org/extension/3013/invert-window-value/

I try to search solution which works for the whole desktop.

Thank you,

H.