Comment 3 for bug 41282

yes, that is correct.

pc with single screen has
Horiz. : 24-80
Vert. : 49-75

pc with dual screens have:
Horiz. : 28.0-33.0
Vert. : 43-72
( both screens identically detected )

What do you mean about screens? what exactly do you need to know?

The second screen was "dual screen", not "clone primary screen", and the primary screen was at the right.