emulate a Xorg configuration of GNU/Linux (Fedora 21) on FreeBSD

[Chris Hill]

On Sun, 4 Jan 2015, Polytropon wrote:

> On Sun, 4 Jan 2015 11:20:52 -0500, Xavier Freebsd Questio via freebsd-questions wrote:

[ snip ]

>> I try it and don't get output for
>> VGA external connector when I plugin it in HDMI input connector of TV.
>
> Ah! That could be the problem!

I'll bet money that IS the problem.

The solution is to use a display that supports the signal the laptop 
puts out - apparently VGA in this case. Failing that, use a laptop that 
puts out a signal format your display can accommodate - apparently HDMI 
in this case (but you could also use Display Port with a connector 
adaptor).

> HDMI isn't capable of mapping _all_ imaginable DVI (or VGA)
> outputs generated by a computer. This usually shows that you
> can use a TV as a computer monitor in many cases, but not
> in all cases.

In this particular case - a device with VGA output feeding a display 
with HDMI input - I would not expect it ever to work. The VGA connector 
only carries anaolog video. HDMI only carries digital.

I'm guessing that the OP is using a VGA to DVI-I adaptor cable, followed 
by a DVI-I to HDMI adaptor cable; this is the only setup I can think of 
that would even allow things to be plugged in. But as we've seen in past 
examples, having a plug that fits is necessary but not sufficient.

Once that's resolved, then we can think about EDID and modes and so 
forth.

[ snip ]

-- 
Chris Hill               chris at monochrome.org
**                     [ Busy Expunging </> ]