Mini Display Port to DVI/VGA Cables

Discussion in 'MacBook Pro' started by Aboo, Jan 14, 2009.

  1. Aboo macrumors 6502a

    Joined:
    Jul 7, 2008
    #1
    Hi Guys,

    I wanted to ask all of you experts on here for some advice. I recently got a macbook pro unibody and I ordered the mini display port to dvi adapter with it. At home, I have a Dell 2007FPW to which I would liketo connect my MBP using the above-mentioned adapter. So far no problems. At work however, we still have an older projector which supports VGA input only. Honestly, I dont want to spend another 30 bucks so that I could get my MBP to work on the projector so I was wondering if this option might work. Our office has a dvi to vga adapter that was used with the older gen MBPs. I was wondering if I could still output my MBP to the projector using the mini display port to DVI connector plugged into the DVI-to-VGA adapter (and then use a regular vga cable to connect to the projector). Would this work or am I better of just spending the money on the VGA adapter?

    Besides, purchasing a DVI to VGA adapter would cost less then 10 bucks as opposed to 30 for the mini display port to vga adapter.

    Thanks in advance!
     
  2. kolax macrumors G3

    Joined:
    Mar 20, 2007
    #2
    Nope - you have to buy two separate adapters. I fell into the same boat when I tried using my existing DVI to VGA adapter.

    Read about it here.
     
  3. raymondu999 macrumors 65816

    Joined:
    Feb 11, 2008
    #3
    I believe the Mini-DP to Dual-link DVI adapter, however, can be then linked up with DVI to VGA for such an outcome.
     
  4. areusche macrumors regular

    areusche

    Joined:
    Jun 24, 2008
    #4
  5. TBi macrumors 68030

    TBi

    Joined:
    Jul 26, 2005
    Location:
    Ireland
    #5
    I'd be surprised if this is true. The Dual-DVI probably has the same digital-only limitation that the DVI one has.

    You can't use these with the Apple Mini-DP to DVI adapter because it is digital only.
     
  6. Anonymous Freak macrumors 601

    Anonymous Freak

    Joined:
    Dec 12, 2002
    Location:
    Cascadia
    #6
    Unfortunately, neither of these will help.

    Apple's Mini DisplayPort to DVI adapter does *NOT* pass the VGA signal through. This means you cannot just use a DVI-to-VGA adapter, at all.

    The underlying problem is that DisplayPort doesn't contain enough pins to pass through both DVI and VGA at the same time. You *NEED* a dedicated adapter for each type. The DisplayPort senses which adapter you have, and passes through that signal, and only that signal.

    Same is true for the Dual-Link DVI adapter. DisplayPort doesn't contain enough pins for Dual-Link DVI, so this takes an active signal converter. (Hence the high price.) But again, Apple makes no effort to pass through a VGA signal. (Which would be silly, since it would make the DL-DVI adapter even *MORE* expensive, since then it would require a VGA DAC as well.)

    Sorry, but when converting from DisplayPort to anything, you need separate adapters. This is not an Apple limitation, this is not a Mini DisplayPort limitation, this is a DisplayPort-base-spec limitation.
     
  7. areusche macrumors regular

    areusche

    Joined:
    Jun 24, 2008
    #7
    Ahh my bad sorry I was misinformed!
     
  8. sesnir macrumors 6502

    Joined:
    Sep 21, 2008
    #8
    MD to DVI

    MD to VGA

    You could buy both for the price of the one from Apple - available tomorrow.

    Since you already bought one, at least you can get the VGA one at a cheaper price.
     

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