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Can I use both DVI-D and VGA at the same time with 2 different monitors?

Posted on 2012-09-10
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Hi,

I have got a HP Pavilion p7-1227 PC that has the following Video card: AMD Radeon HD 6550D integrated graphics with two connectors: DVI-D and VGA 15 pin.  Now, I do have 2 monitors with only VGA connections. My question, can I use both the monitors at the same time? I understand I need an adapter for the DVI-D port (Male-DVI-D to VGA adapter). If I buy that adapter, can I use both the monitors at the same time and with 2 different screens on two monitors? Thanks in advance for your input.
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Question by:Byas_Saha
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by:kristof1104
ID: 38384804
I think so, but to be safe check if the card has eyefinity
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by:joelsplace
ID: 38384810
http://www.amd.com/es/products/desktop/graphics/amd-radeon-hd-6000a/hd-6550a/Pages/amd-radeon-hd-6550a.aspx#2
This says it will support dual monitors but doesn't specify if the DVI will run a analog monitor.  They don't always.
Here's a link that tells what the pins do:  http://en.wikipedia.org/wiki/Digital_Visual_Interface
If the 2 pins above and below the blade in the connector are missing it won't do analog.
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by:acseven
ID: 38384811
Hi,
According to HP, yes.

Read here, under Video Graphics:

HP Pavilion p7-1227c Desktop PC Product Specifications

Quote:
"DVI and VGA ports (Can be used at the same time)"

Cheers
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by:garycase
ID: 38384845
The answer is NO !!

As noted above, your system does support the use of two monitors, one DVI and one VGA, at the same time.

But your DVI port is a DVI-D port,   NOT a DVI-I port.    So you can't use a simple DVI -> VGA adapter, as there's no analog signal available on your DVI port.

You could, of course, buy a DVI-D to VGA convertor -- but a new video card with the outputs you need would be less expensive :-)

[e.g. http://www.amazon.com/StarTech-com-DVI2VGACON-Resolution-Video-Converter/dp/B002XVTBB8/ref=sr_1_1?s=electronics&ie=UTF8&qid=1347315439&sr=1-1&keywords=dvi-d+to+vga+converter ]
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by:Andrej Pirman
ID: 38384894
There is no definite answer, without either TESTING it out, or getting 100% answer from HP documentation!

As DVI-D-to-VGA adapter exists, at first sight it contradicts the logic:
DVI-D is pure digital,
and VGA is pure analogue
So how can a passive port adapter convert the signal?

The answer is: it can't and it does not do any digital-to-analogue conversion!

The adapter does not convert the digital signal to analogue, rather it enables the analogue converter chip on the video card. Basically the video card pumps out an analogue signal on the dvi port when DVI-D-to-VGA adapter is detected.

So there is a posibility that your config with 2 VGA monitors WILL WORK.
I suggest you test is out - mantioned adapter is not expensive, so few dollars and you will either got a working setup, or some knowledge for few dollars ;)
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by:acseven
ID: 38384929
Following the last two last comments, and considering the info on the HP's white paper site, you can consider to simply contact HP.
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by:joelsplace
ID: 38384941
If he's missing the 2 pins above and below the blade it will not work.  That is pretty definite.  If it does have the pins then it will have to be tested because we know the chipset is capable but not if HP did something funny to keep it from working. (like not connecting the analog wires to the output)
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by:Purple_Tidder
ID: 38384972
Garycase is correct, and the DVI-D to VGA "adapter" he linked to would do the job.  It's powered off of USB and is a signal converter.  It is definitely cost prohibitive though.

Labsy, what adapter are you talking about?
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by:garycase
ID: 38385004
"... There is no definite answer ..." ==>  Wrong.   The answer is, as I noted above, NO.

The DVI output on this system is a DVI-D output, NOT a DVI-I.     Thus there are no analog signals available for a simple adapter (which does nothing more than take the analog signaling from the 4 extra pins in a DVI-I output and route them to the appropriate DB-15 pins).

You can clearly see the DVI-D plug on a picture of the back panel (from HP's site) ... and it is not only clearly a DVI-D plug, but it's also clearly identified as such in the key below the picture.

[embed=file 602281
ATX-Panel-for-HP-P7-1227.jpg
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by:Purple_Tidder
ID: 38385104
joelsplace and garycase are correct.

Sometimes manufacturers will do something out of spec and provide special adapters but I highly doubt that's the case here considering HP probably bought and rebranded another manufacturer's motherboard for this machine.
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by:garycase
ID: 38385311
Not even re-branded -- the motherboard is an MSI MS-7778
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by:web_tracker
ID: 38385383
Instead of buying the converter cable lcd monitors are cheap you probally better off buying a monitor that suppors dvi-d convention. you would get better resolution and probably a better larger screen than is your current vga monitor.
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by:garycase
garycase earned 2000 total points
ID: 38385509
As I noted in my initial comment, the least expensive option is to simply buy a PCIe x16 video card that supports dual VGA outputs [or one VGA and a DVI-I output that you can use a simple adapter plug with]
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Byas_Saha earned 0 total points
ID: 38430548
After trying several things, I spoke with HP. They clearly said, without adding an additional video card, I cannot use 2 monitors(no matter VGA or DVI) in that HP machine. Per Garycase, yes my option was to buy and install a PCIe x16 video card that supports dual VGA outputs but this is what I choose to do: I went for shopping and did buy one  "USB 2.0 to VGA pro" (made by SIIG). As soon as I plugged in the device, driver was automatically downloaded and within few mins I was able to use both the monitors. For under 45 dollars, SIIG - USB 2.0 to VGA Pro is a great tool. thanks all for your comments.
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Author Closing Comment

by:Byas_Saha
ID: 38446922
I found this easy to use/install USB to VGA adapter that solved my issue.
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