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DVI Cables - HDCP

M

mike_j_johnson

Gawd
Joined
Nov 13, 2004
Messages
961
Will HDCP monitors require a special type of DVI cable? (or will any DVI cable work)

What types of DVI cables are there anyways?

Single Link

Dual Link

DVI-D

DVI-I

?
 
Any DVI-D should work. I can't imagine them allowing you to use a DVI-I as it carries analogue signal as well, I know my new gateway will only accept DVI-D as it does not have the 4 pins around the slot to accept the DVI-I cable. It is a HDCP capable monitor.
 
ND40oz said:
Any DVI-D should work. I can't imagine them allowing you to use a DVI-I as it carries analogue signal as well, I know my new gateway will only accept DVI-D as it does not have the 4 pins around the slot to accept the DVI-I cable. It is a HDCP capable monitor.
Click to expand...

Agreed, I beliee we both hae the same gateway monitor (dfp2185w and it is HDCP DVI-D working fine here too. I think it's pretty safe to say dvi-d is the way to go with the new HDCP Standard as far as DVI is concerned.

L.E.
 
The cable should be included in the monitor anyway, but again its not a problem.

And it seems DVI-I is fading out, most LCD monitors come with DVI-D cables and last time I checked Newegg only had 1 cable model that supports DVI-I.
 
Stoly said:
The cable should be included in the monitor anyway, but again its not a problem.
Click to expand...

Tell that to Gateway :confused: they don't include one with the 2185W
 
Stoly said:
And it seems DVI-I is fading out, most LCD monitors come with DVI-D cables and last time I checked Newegg only had 1 cable model that supports DVI-I.
Click to expand...

It looks like you can use a DVI-I cable instead of a DVI-D cable, but not vice-versa...

I think DVI-I cables are just more expensive to manufacture and they have less and les smonitors which require the analogue signal. However, I have an IBM p275 which has dual inputs a DVI and standard VGA D-Sub, anyway I bought a DVI-D cable on accident!!!

If anyone wants to trade DVI-D for a DVI-I cable lmk...
 
J-Mag said:
It looks like you can use a DVI-I cable instead of a DVI-D cable, but not vice-versa...

I think DVI-I cables are just more expensive to manufacture and they have less and les smonitors which require the analogue signal. However, I have an IBM p275 which has dual inputs a DVI and standard VGA D-Sub, anyway I bought a DVI-D cable on accident!!!

If anyone wants to trade DVI-D for a DVI-I cable lmk...
Click to expand...

Most of the HDCP monitors only have a DVI-D connector, there is no way you can shove a DVI-I cable into that connector. It doesn't allow for the 4 extra pins on the sides of the slot connector. I think what you mean is you can use a DVI-D cable for DVI-I connections as long as you don't need analogue signal.
 
J-Mag said:
It looks like you can use a DVI-I cable instead of a DVI-D cable, but not vice-versa...

I think DVI-I cables are just more expensive to manufacture and they have less and les smonitors which require the analogue signal. However, I have an IBM p275 which has dual inputs a DVI and standard VGA D-Sub, anyway I bought a DVI-D cable on accident!!!

If anyone wants to trade DVI-D for a DVI-I cable lmk...
Click to expand...

I think its the opposite.

You can't use DVI-I cable on a DVI-D LCD, but you can use a DVI-D cable on a DVI-I LCD monitor.

Oooh I see now, the IBM P275 is CRT, thats why you need a DVI-I cable.
 
ND40oz said:
Most of the HDCP monitors only have a DVI-D connector, there is no way you can shove a DVI-I cable into that connector. It doesn't allow for the 4 extra pins on the sides of the slot connector. I think what you mean is you can use a DVI-D cable for DVI-I connections as long as you don't need analogue signal.
Click to expand...

You could probably just break the four pins off or i am sure there is a DVI-I to DVI-D converter anyway....

All I am saying is that the DVI-I cable has the same singal carrying capability AND more than the DVI-D cable.
 
Stoly said:
Oooh I see now, the IBM P275 is CRT, thats why you need a DVI-I cable.
Click to expand...

Yeah exactly.... and I was to ignorant to realize the differences so I bought a "dvi" cable because I was unfamiliair. It hooked up fine to my monitor but i got no signal (which is understandable now)

My question is why did IBM put the DVI port on the back? Would it be better for me to use a DVI-I than my standard VGA ? Is the monitor only taking signal from the 4 extra pins of the DVI-I or it it getting a signal both digitally and analogue?

Anyway I ended up with a dual link DVI-D cable...
 
Actually gentleman it should be the other way around. I do tech support for nvidia based videocards and all of our cards that have dvi use a dvi-i port because on that port any dvi cable will fit. DVI-i is the universal DVI interface It has the most pins do if you have a dvi-d or a dvi-a it will fit. Now what this thread is about is the fact that with HDCP (High Def Content Protection) they have made the monitors specifically require dvi-d or dvi-a but not dvi-i. I believe there is something with the hdcp tech, that makes it require digital signal specifically. There is a interesting article on pcworld.com that talks about how vista will not play any blueray or hddvd content on your monitor unless it has hdcp.

Here it goes.

http://www.pcworld.com/news/article/0,aid,122738,00.asp

L.E.
 
Lord_Exodia said:
Actually gentleman it should be the other way around. I do tech support for nvidia based videocards and all of our cards that have dvi use a dvi-i port because on that port any dvi cable will fit. DVI-i is the universal DVI interface It has the most pins do if you have a dvi-d or a dvi-a it will fit. Now what this thread is about is the fact that with HDCP (High Def Content Protection) they have made the monitors specifically require dvi-d or dvi-a but not dvi-i. I believe there is something with the hdcp tech, that makes it require digital signal specifically. There is a interesting article on pcworld.com that talks about how vista will not play any blueray or hddvd content on your monitor unless it has hdcp.
Click to expand...

Yeah they obviously don't want any anologue signal because if you can see an analogue signal you can copy the content no matter what encryption is in place...
 
Lord_Exodia said:
Actually gentleman it should be the other way around. I do tech support for nvidia based videocards and all of our cards that have dvi use a dvi-i port because on that port any dvi cable will fit. DVI-i is the universal DVI interface It has the most pins do if you have a dvi-d or a dvi-a it will fit. Now what this thread is about is the fact that with HDCP (High Def Content Protection) they have made the monitors specifically require dvi-d or dvi-a but not dvi-i. I believe there is something with the hdcp tech, that makes it require digital signal specifically. There is a interesting article on pcworld.com that talks about how vista will not play any blueray or hddvd content on your monitor unless it has hdcp.

Here it goes.

http://www.pcworld.com/news/article/0,aid,122738,00.asp

L.E.
Click to expand...

The point is, HDCP is not going to allow analogue connections (VGA, DVI-I or DVI-A) on the display, if they did, the signal wouldn't be digitally encrypted and anything could be used to capture it. The MPAA doesn't want you to be able to digitally record High Def content from cable, HD-DVD, blue-ray or any other high def source. This is why microsoft is forced to adopt the HDCP support for Vista.

It makes sense to have DVI-I on a video card, this allows the user to use an adaptor for a vga connection, if it was a DVI-D connector then it couldn't use a vga adaptor rendering that port useless for vga use. But it doesn't make sense to allow it on the display (from a content protection standpoint), for reasons mentioned above.
 
J-Mag said:
Yeah they obviously don't want any anologue signal because if you can see an analogue signal you can copy the content no matter what encryption is in place...
Click to expand...

You are totally correct. I think the article I linked to before touches on that too. Interesting stuff. Imagine if law brought to legislation by MPAA requires HDCP if you are about to purchase a new monitor this feature may be paramount.

L.E.
 
Okay...so now we know you have to have either:

Single Link DVI-D

or

Dual Link DVI-D

So now my question is, will you beable to see the POST screen with a DVI-D connection? I thought POST used analog and then once Windows booted, it switched to digital. I may be totally wrong, but I believe I heard that somewhere (hence one of the reasons most video card DVI outs are DVI-I).

Also, I wish there was a way to prevent the screen from stretching during POST. Maybe newer BIOSes have an option for 1:1 screen resolution during POST. I know I have seen this on some laptops...just not desktops. Kind of a nit-picky request I guess...*shrug*
 
It should post fine. I have the monitor mentioned in my sig. below It's widescreen has hdcp & my cable is dvi-d. Works fine during post and anywhere else.
 
FYI, when I bought the gateway last week, I picked up a 12 foot DVI gold series cable at Radio Shack for 12.50 (regularly 50 bucks).
 
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