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Date:      Sun, 4 Jan 2015 12:21:43 -0500 (EST)
From:      Chris Hill <chris@monochrome.org>
To:        Polytropon <freebsd@edvax.de>
Cc:        Xavier Freebsd Questio <xavierfreebsdquestio@aim.com>, Xavier Freebsd Questio via freebsd-questions <freebsd-questions@freebsd.org>
Subject:   Re: emulate a Xorg configuration of GNU/Linux (Fedora 21) on FreeBSD
Message-ID:  <alpine.BSF.2.00.1501041206560.74333@tripel.monochrome.org>
In-Reply-To: <20150104180240.6c6cf30b.freebsd@edvax.de>
References:  <8D1F641A1D2B4CB-15D0-A6C2@webmail-vm170.sysops.aol.com> <20150104153549.70c269ae.freebsd@edvax.de> <8D1F6518B6F7572-15D0-ABA6@webmail-vm170.sysops.aol.com> <20150104180240.6c6cf30b.freebsd@edvax.de>

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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@monochrome.org
**                     [ Busy Expunging </> ]



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