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Date: Wed, 30 Mar 2016 18:32:56 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Anton Shterenlikht <mexas@bris.ac.uk>
cc: tijl@FreeBSD.org, freebsd-x11@freebsd.org
Subject: Re: Haswell composite desktop - laptop+HDMI monitor - how?
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On Wed, 30 Mar 2016, Anton Shterenlikht wrote:

> Also, I'm confused by xrandr reporting only screen0.
> Previously, with nvidia, I had in xorg.conf screen0
> and screen1 positioned to the right of screen0.
> Perhaps xrandr uses a different terminology to xorg.conf?

In the old days, there were separate screens for different monitors. 
That still happens, but rarely.

Now there is only one screen.  Both monitors are on that one screen.

xrandr --auto puts both monitors at the same spot.  If you want them to 
be side by side, displaying different parts of the same screen, use the 
xrandr options for right-of or left-of.  An example is shown in the 
xrandr section.
https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/x-config.html#x-config-monitors-xrandr

The screen size is calculated from the size of the monitors.  No other 
configuration in xorg.conf is needed unless the monitor EDID does not 
supply enough information, and that is vanishingly rare any more.