Re: DV-I cable with VGA integrated video: Resolution?

kerumbo wrote:
Just got a new computer, decided I'd just get the integrated video since I'm not a gamer and might have other uses for the PCI-e slot. It's the Intel Graphics Media Accelerator 3100, which I believe has an Nvidia chipset. Running WinXP (yes, with a new computer! -- my choice).

Meanwhile I had a flat-screen monitor with native res 1680x1050. Before the PC arrived, I attached a DV-I cable to the flat-screen, assuming that any new computer (even using integrated video) would have a DV-I connection. Wrong!

So I attached the monitor with VGA cable, although the DV-I cable was also still on the monitor. I set the res at 1680x1050, which looked fine. After getting the computer reasonably set-up, I began some housekeeping, and removed, from the monitor, the DV-I cable that could not be connected to the PC.

Well, I was suprised by what happened: Suddenly 1680x1050 was NOT available in Control Panel|Display, and I could not find any resolution that looked decent. Attempts to set higher resolutions got "beyond the range of analog" or similar error message. Several reboots did not help.

I never thought this would help, but just to trouble-shoot, I reattached the DV-I cable to the monitor (leaving the VGA cable connected at both ends), the other end of the DV-I cable just hanging off the desk. And then, all resolutions including 1680x1050 were avaailable again!

Obviously the connection is analog, since the DV-I cable is only attached to the monitor. But I am getting a resolution supposedly unavailable in analog. It seems that for some reason, there are resolutions I can only get when the DV-I cable is attached (even though only to the monitor -- an LG Flatron L227WTG).

So I am happy that it now works, but my question is: How weird is this? Is this a "feature", or a bug? Just wondering, but I'd like to understand this.


I download the manual here, and there is no suggestion in there, of such a
behavior.

http://www.lge.com/us/support/product/support-product-profile.jsp?customerModelCode=L227WTG-PF&initialTab=documents#

According to the specs, it offers 1680 x 1050 @ 60Hz on both the DVI-D and
the VGA connector. I don't see a reason for the panel to be ignoring
its native resolution of 1680 x 1050.

It is possible that the monitor can detect a cable attached to the
DVI-D connector. Check to make sure the cable attached, is DVI-D as
well. DVI-D male, would not have the pins in the cross shaped
area installed. But once the cable is detected, why should the
monitor make any response at all ? There is no reason to
restrict resolutions at the panel end.

http://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/DVI_Connector_Types.svg/277px-DVI_Connector_Types.svg.png

I'd say it is a bug.

Maybe the panel has more functions, than are being used in this
application, and one of those functions becomes activated.

Paul
.

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