[GRLUG] VGA / video question

John-Thomas Richards jtr at jrichards.org
Sun Mar 22 20:21:50 EDT 2015

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.
Everyone is born with genius, but most people only keep it a few minutes.
Edgard Varese, composer (1885-1965)

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