Ubuntu DVI video port support

[ZIYAD A. M. AL-BATLY]

On Mon, 2005-07-25 at 21:11 -0700, William Chapman wrote: 
> Ziyad,
> 
> Thanks for sharing!
> 
> Of course you are correct about there being two DVI specs, but you
> said, "...DVI-I which is analog..."  I think this is incorrect;
> actually, the DVI-I interface carries BOTH the digital AND analog
> signals.  If you plug the DVI-I cable into a DVI port on an LCD
> monitor, it SHOULD BE a "digital deal;" however, because the analog
> signals are "in the cable," an adaptor can be used (as you pointed
> out) to bring the analog signal out to a standard VGA connector, if
> that is the only kind of monitor available.
> 
> In this case, the digital signals present in the cable are simply not
> used.  Also, I think the number of pins, and the exact pin layout is
> different between the two specs.  And there are other subtleties.  In
> case you haven't see it, the following link has some pictures and
> reasonable clear explanations:
> 
> http://www.mycableshop.com/3rd_Level/Video-Flat.htm
> 
> HOWEVER, on the other hand, if it is true, as you say, that some LCD
> monitors with DVI-I interfaces utilize the ANALOG signals in the DVI-I
> cable, and NOT the digital ones, and that this information is somehow
> hidden from their customers, then these vendors should marked out and
> driven into the sea!!  What is the make and model of your monitor?
> 
> Is it possible that your situation could be solved with a different
> cable?  (However, most LCD displays come with the "correct" cable for
> the monitor.)
> 
> Kindly,
> 
> Bill Chapman
> 
My monitors ships with an old VGA d-sub 15 cable and not DVI at all.  I
wasn't clear in my post and for that I apologize.

Obviously (and thanks to you), I was wrong in my previous post about the
types of DVI.  I was under the imprison there were *only* two types of
DVI and one of them (the DVI-I) is analog which is wrong.

Again, thanks for correcting my mistake and sorry for that.

(My original post was to point out that some certain VGA cards ships
only with *one* DAC (Digital to Analog Converter) and not two even
though there are two ports at the back of the card.  Mine is like this.
Digital monitors doesn't need any DAC.)
Ziyad.