[GRLUG] FW: VGA / video question

Mike Miller ironmike52 at hotmail.com
Tue Mar 24 11:47:40 EDT 2015

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Date: Tue, 24 Mar 2015 11:23:30 -0400
Subject: Re: FW: [GRLUG] VGA / video question
From: tangenmark at gmail.com
To: ironmike52 at hotmail.com

We do a 125' run using a passive DVI over CAT6 converter and DVI to HDMI converter:
this conversation popped up on the local linux user board.  also, John-Thomas was our fill in preacher from Calvary Church between Pastors.  

I tried to help him with some of the stuff we learned doing our video screen setup.  anything you can add might help.
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> Date: Sun, 22 Mar 2015 20:21:50 -0400

> From: jtr at jrichards.org

> To: grlug at grlug.org

> Subject: Re: [GRLUG] VGA / video question


> On Sun, Mar 22, 2015 at 05:23:23PM -0400, Mike Miller wrote:

> > > From: jtr at jrichards.org

> > > This is not strictly Linux-related so please indulge me.

> > > 

> > > We bought a couple 65" TVs (cheaper than a projector/screen) for Sunday

> > > morning worship services (lyric projection, etc.). I have a laptop with

> > > Ubuntu running OpenLP (open source lyric projection). The TVs do not

> > > have a VGA connector and the laptop only has a VGA connector. I bought

> > > two VGA->HDMI adapters. When I connect the laptop to this with a short

> > > VGA cable (~6') I get full 1920x1080. This runs through a 4-port VGA

> > > video splitter, also with a ~6' cable. Works as it should. However, when

> > > I connect a 75' video cable from the laptop to the splitter Ubuntu only

> > > wants 1024x768 (verified via 'xrandr -q' on the CLI). This seems like a

> > > loss of video signal. Would a VGA signal booster eliminate this? I don't

> > > want to spend more money without being sure. This seems plain to me, but

> > > I want to make sure I am not missing anything.

> > > 

> > This is Mike from Brightside Church. Your problem is that hdmi

> > doesn't travel over 50 feet without an amplifier. We tried to do the

> > same thing with the same results. 

> > What we ended up doing was to convert the signal with a hdmi to cat5

> > adapter and then back again at the projector. 


> The HDMI portion is just six feet. If I boost the signal over the

> longest distance (from the laptop to the VGA splitter) will this work?

> CAT5 sounds great but given the VGA to HDMI conversion (with a signal

> split before the conversion) I'm not sure that's a viable option.

> -- 

> john-thomas

> -----

> Everyone is born with genius, but most people only keep it a few minutes.

> Edgard Varese, composer (1885-1965)

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