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multiple displays on AMD 7450 adapter

Posted on 2013-10-29
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Last Modified: 2013-11-27
new Lenovo M92P with AMD7450 graphics card. Currently have Lenovo L2251 monitor connected using a D-DVI (single link) cable. Under Device Manager it appears to Win 7 64 bit as ANALOG.

Can not get dual displays even detected when 2nd display is either VGA on Motherboard or VGA via Lenovo DISPLAYport-to-VGA adapter.

Tried changing BIOS from the various video start up options.

What is the secret ?
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Question by:jtd1
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Author Comment

by:jtd1
ID: 39610337
Also, I FORCED a 2nd VGA display via the "Another display not connected" option and now I cant get rid of the phantom 2nd display no matter what
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Expert Comment

by:garycase
ID: 39610692
Your monitor doesn't have a DVI input, so if you're using a DVI adapter cable to the DSUB input, then you are indeed using an analog connection.

It does, however, have a DisplayPort input -- and your card has a DisplayPort output;  so you should use a DisplayPort cable to connect them.

I suspect that if you do that you'll be able to support a 2nd analog display with no problem.
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Accepted Solution

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jtd1 earned 0 total points
ID: 39611292
Solved the issue.  Both the display port and VGA from the motherboard are disabled when the PCI adapter installed.

Using the DisplayPort from the PCI adapter as 2nd monitor worked fine.

Existing monitor was using DVI port and was a digital connection it just the description that throws you off since it displays the monitor as "Lenovp LXXX...Analogue" but it in fact was digital.  It has no choice to be digital when the DVI cable being used is DVI-D - no analogue pins.

Thanks
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Author Closing Comment

by:jtd1
ID: 39680258
fixed it myself
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