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I have an Asus P5KPL-AM IN/GB motherboard with onboard graphics connected to a Dell 1708FPb 17 inch flat panel monitor.

The second (identical) display is connected to an Nvidia GeForce 210 PCIe graphics card, also using a VGA lead.

When the machine boots up, the monitor connected to the onboard graphics VGA adapter is not detected. I have tried using another adapter, which didn't work.

Is is possible to run two displays simultaneously, both connected using VGA leads, one via onboard graphics and the other from an independent graphics card?

Or do I need to buy a separate DVI cable and run both monitors from the PCIe graphics card?

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migrated from serverfault.com Aug 9 '11 at 11:42

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2  
What OS are you using? –  MadHatter Aug 9 '11 at 11:23
2  
Windows XP Home and Ubuntu 11.04 dual boot. –  mejpark Aug 9 '11 at 11:51

2 Answers 2

The G31(which your motherboard has) chipset does not support Concurrent video card and onboard graphics.

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Thank you for confirming this. Can I ask how you found this information out? –  mejpark Aug 10 '11 at 12:04

This will depend on the motherboard/BIOS. Some allow the onboard graphics others don't.

It appears that the Asus doesn't and to run a second monitor you'll have to use the 2nd output on the graphics card.

You don't have to buy a DVI lead - though using one will give you a better image - you can get DVI to VGA converters and use your existing lead.

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How did you find out that the motherboard doesn't allow this? Is it worth buying a DVI lead or would you buy a DVI-VGA adapter? If I opt for a new DVI lead, will I see a noticeable increase in performance? –  mejpark Aug 9 '11 at 12:05
    
@mejpark - I don't know how you find out other than checking the manufacturer's site. As I said a DVI lead will give a better image as it's all digital. What do you mean by "performance"? –  ChrisF Aug 9 '11 at 12:35
    
mejpark: Some older low-end Intel motherboards have on-board video that stops functioning when an add-in card is installed in the AGP slot. The only ways to determine if this is the case for your motherboard is to either try it, or consult the motherboard's documentation. –  Randolf Richardson Aug 9 '11 at 12:37
    
@Randolf I tried it, it failed which would assume that it is indeed unsupported. I've looked in the manual for my motherboard and searched online and I can't find anything definitive. I was hoping to read it for myself in black and white. Can either of you provide a link to confirm that this is in fact the case? –  mejpark Aug 9 '11 at 13:41
    
@mejpark: If your motherboard documentation doesn't mention this, then you might ask the manufacturer if you're experiencing a defect -- if they say "yes," then you may be able to get it replaced (I've found that occasionally manufacturers will still replace out-of-warranty equipment if the problem is caused by a serious design defect; I had a motherboard once that was 5 years old that I got replaced for free because its manual mistakenly indicated that it could support more RAM, but I discovered this was incorrect when I added more RAM). –  Randolf Richardson Aug 9 '11 at 14:14

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