bash imagemagick import screen capture with minimized and maximized windows

Question

I want to do a simple full screen capture from a bash script in ubuntu. This:

import -window root screen.png

from imagemagick worked fine, untill--- I switched to a laptop with an external display connected. Now the captured image is not what is shown on the screen, but instead it shows the different windows. Is there a way to control this behavior of import, or do I need another tool?

Edit:

It is very important for me that no mouse-click is needed, as the script is run without human interaction.

Edit:

The real problem is not what I original thought, but it is an error of import - It can not handle maximized or minimized windows correctly.

Answer 1

Specifying display and window will remove the need for mouse click:

import -display :0.1 -window root -colorspace RGB -quality 80 screendump.jpg

Answer 2

Tell it to use a specific screen.

import -display :0.1 ...