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Date: Fri, 16 Oct 2015 08:11:24 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: "Brandon J. Wandersee" <brandon.wandersee@gmail.com>
cc: Erich Dollansky <erichsfreebsdlist@alogt.com>,
 German <gentgerman@gmail.com>, freebsd-questions@freebsd.org
Subject: Re: X won't start
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On Fri, 16 Oct 2015, Brandon J. Wandersee wrote:

> Warren Block writes:
>
>> The X meta-port or package install a set of drivers.  "No screens found"
>> usually means there is something weird, like a multi-GPU setup
>> (Optimus).  Without knowing what hardware is involved, it's hard to be
>> more specific.
>
> Display drivers don't get installed with the X.org distribution;

Not sure what you mean by "distribution", but the port/package depends 
on the x11-drivers/xorg-drivers port, which is installed because of 
that.  From x11/xorg/Makefile:

   RUN_DEPENDS+=   xorg-apps>0:${PORTSDIR}/x11/xorg-apps \
                   xorg-libraries>0:${PORTSDIR}/x11/xorg-libraries \
                   xorg-fonts>0:${PORTSDIR}/x11-fonts/xorg-fonts \
                   xorg-drivers>0:${PORTSDIR}/x11-drivers/xorg-drivers

The Nvidia binary drivers are a special case due to their closed binary 
nature, and are not part of the xorg-drivers port.  nv is part of 
xorg-drivers, though some drivers are not enabled by default.  The Intel 
and AMD drivers are.

People also sometimes install xorg-minimal rather than the full xorg. 
That is usually a mistake.