Can't duplicate display on HDMI and VGA outputs (ATI Radeon HD4200)

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  1. itm
    Posts : 53
    Windows 7
    Thread Starter
       #11

    That's an interesting idea. There is a DVI port on the graphics card. I'll see if I can get hold of a DVI to component video cable to try it out (the target for the 2nd display only has component, S-Video or composite inputs).
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  2. bobkn's Avatar
    Posts : 3,617
    Win 10 X64 Pro 21H1 19043.928
       #12

    itm said:
    That's an interesting idea. There is a DVI port on the graphics card. I'll see if I can get hold of a DVI to component video cable to try it out (the target for the 2nd display only has component, S-Video or composite inputs).
    I'm not very familiar with component video. The analog output of a DVI-I port (both analog and digital) can be sent to a VGA monitor using a passive adapter. It's RGB. Component video generally isn't RGB; it uses chrominance and luminance information.

    It may be possible to cause the graphics card to output component video as the analog output of a DVI port, but I'm unaware of that.

    There are active adapters to take HDMI to component. If you don't have an HDMI output, you could combine a passive DVI to HDMI with HDMI to component. (Sounds like a kludge, I know.)
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  3. itm
    Posts : 53
    Windows 7
    Thread Starter
       #13

    It turns out that the graphics card cannot output via DVI and HDMI simultaneously - it's either one or the other :0(
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  4. alphanumeric's Avatar
    Posts : 14,094
    Windows 10 IoT
       #14

    itm said:
    It turns out that the graphics card cannot output via DVI and HDMI simultaneously - it's either one or the other :0(
    That happens some times. The two sockets are actually wired to the same video card output. It saves you from having to use an adapter. It's a convenience thing. Or so they claim. I'm not a big fan of that type of setup myself. It just confuses things IMHO.

    Keep in mind though, you need DVI-I to get an analog signal out of it. DVI-D (Digital only) won't provide the signals needed to get an analog signal with a passive adapter.
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