What is the result of connecting a single link (DVI-D) video source to a dual link monitor?

[Alex Hewitt]

Shawn O'Shea wrote:
> On Wed, Oct 14, 2009 at 5:37 PM, Alex Hewitt <hewitt_tech at comcast.net 
> <mailto:hewitt_tech at comcast.net>> wrote:
>
>     I'm trying to connect a new Mac Mini to a Barco monitor. The Barco
>     monitor expects a dual link video source (2048 x 1536 /1536 x
>     2048) but
>     the Mini is outputing single link DVI-D.  The Mac  sees the monitor as
>     having a resolution of 1280x1024. Apple makes a dual link DVI adapter
>     but I don't know if this will allow the Barco to work properly. Anyone
>     have any experience with this kind of setup?
>
>
> Single-link DVI has less pins/wires and maxes out at 1920x1200 
> resolution. For higher resolutions, you need the extra wires and can 
> go to 2560x1600. You need to also make sure that the DVI cable you are 
> using is dual link as well.
> Pictures of connector types:
> http://www.interfacebus.com/Design_Connector_Digital_Visual_Interface_DVI_Bus.html
> Discussion of single vs dual with resolution information:
> "WHAT ARE SINGLE AND DUAL LINKS ?" section of 
> http://www.datapro.net/techinfo/dvi_info.html
>
> -Shawn
>  
>
>     The Mac Pro does have a dual link video but I'm not sure if that
>     system
>     would also have the same problem. The Barco site only describes MS
>     Windows systems and provides drivers for the same.
>
>     -Alex
>
>     P.S. BTW, we did connect a Totoku 3MP display (2048x1536) which uses a
>     DVI-D connection and that display worked at full resolution.
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>
Thanks Shawn. Good pointers. There is something a bit odd about this 
though. The Totoku monitor is running at it's native resolution 
(2048x1536). The Mac gives me the full resolution as a choice in the 
display preferences. I'll look closely at the connector (miniPort to 
DVI-D) and see if it's actually dual link. The DVI-I dual link is 
definitely not working.

-Alex

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