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Mini DisplayPort to VGA Adapter

481 Views 11 Replies Latest reply: May 7, 2013 11:19 PM by Crissa RSS
Eddie 2008 Calculating status...
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Nov 7, 2012 4:11 AM

Hi, I bought an Mini DisplayPort to VGA Adapter and it doesn´t work, I´ve tried with another and it works, is it possible that I have a preference problem? cheers, Eddie

MacBook Pro (15-inch Late 2011), OS X Mountain Lion (10.8.2)
  • sidonsoft Level 2 Level 2 (275 points)
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    Nov 7, 2012 4:14 AM (in response to Eddie 2008)

    who uses VGA these days?? just kidding, um.. if one works and not the one you just bought sounds like its faulty. 

     

    VGA doesnt Auto-Detect like HDMI and DVI ports, you will have to tell it that something is connected.

  • Crissa Level 1 Level 1 (5 points)
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    Apr 6, 2013 11:23 PM (in response to sidonsoft)

    How would you 'tell' it something is connected to VGA?

     

    -Crissa

  • silvergc Level 3 Level 3 (750 points)
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    Apr 9, 2013 2:41 PM (in response to sidonsoft)

    Actually, the Mac will detect that the external monitor is connected.  I had one (up until a couple months ago) and it always detected the monitor just fine.  DOn't forget that many (if not most) projectors in use today are still VGA .  BTW, I have one of the Apple adapters and it works fine.

  • Crissa Level 1 Level 1 (5 points)
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    Apr 11, 2013 7:48 PM (in response to silvergc)

    That's my experience as well, hence my question.

     

    Although I have a 2012 Macbook 15" that refuses to use any VGA connected through the mini-display connector.  Other Macbooks do just fine...

     

    I've been told that Apple may have dropped DVI-I support, which may be the problem, as that's what I was using (as the first monitor I was trying to use, used that.)

     

    -Crissa

  • silvergc Level 3 Level 3 (750 points)
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    Apr 11, 2013 8:08 PM (in response to Crissa)

    Yes, you are correct, Apple does not support DVI-I any more.  But the VGA adapter has circuitry to generate the analog signals from the display port data. The VGA adapter is supposed to work with all Apple computers with a mini-displayport port. Mine is a late 2011 model with the same port you have (miniDP and Thunderbolt combined).

  • Crissa Level 1 Level 1 (5 points)
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    Apr 26, 2013 5:53 PM (in response to silvergc)

    So what I need is a specifically VGA dongle, and not a DVI-VGA adapter?  Why doesn't the DVI dongle have this in it?  They don't cost more than each other... Bleah.

     

    How do I know that the VGA dongle won't just fail like the DVI dongle did, assuming that the DVI-I support was in there since previous laptops with the same mini Displayport exist?

     

    -Crissa

  • silvergc Level 3 Level 3 (750 points)
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    Apr 29, 2013 2:04 PM (in response to Crissa)

    Crissa,

     

    The older macs used a mini-DVI port, not a miniDP.  That's why you were able to get the analog signal out.  All newer macs are purely digital at the port on the MacBook Pro (or Macbook Air).  You need external circuitry to generate the analog signals necessary for VGA.  That is what the VGA adapters do.

     

    Sorry, but I can't guarantee that you won't have problems.  I can only pass on my own experience with my adapter.

  • Crissa Level 1 Level 1 (5 points)
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    May 1, 2013 1:31 PM (in response to silvergc)

    I'm sorry, silvergc, but the miniDP was used in 2009 on 15" Macbook Pros, and from then onward:

     

    http://support.apple.com/kb/SP544

     

    As I said, I have a selection of 15" macbooks to choose from.  Only the 2012 has this problem.  Your answer is insulting and unhelpful.

     

    -Crissa

  • John Galt Level 7 Level 7 (33,110 points)
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    May 1, 2013 2:11 PM (in response to Crissa)

    Crissa, I suggest you post a new question and describe the problem you want to solve. Whatever it is is unclear from the above and adding to this old post will not help you.

     

    2011 and 2012 model MBPs use Thunderbolt, not MiniDP.

     

    HDCP encoded video cannot be converted to VGA.

    MacBooks  iMacs  iPads  AirPorts, OS X Mountain Lion,  28 years Apple!
  • silvergc Level 3 Level 3 (750 points)
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    May 1, 2013 2:14 PM (in response to Crissa)

    Sorry Crissa, I didn't mean to be "insulting".  That wasn'tmy intent.  I possibly misunderstood your information about you having a selection of macbooks to choose from.  Older macs did use a miniDVI port.  I didn't break down the exact model years since I wasn't aware of the years you had access to and were testing.

     

    Your question was specific about a 2012 vintage MacBook Pro.  All I can say is my late 2011 MacBook Pro (which has the Thunderbolt port which incorporates DisplayPort) works fine with the Apple VGA adapter.  I have used it with external monitors and with projectors.  The miniDP to VGA adapter should work with any computer that has a miniDP port.  The 2012 systems have the same Thunderbolt port, nothing has changed. 

     

    But, some people claim to have problems with VGA adapters in general.  I don't know what the problems are, but I have to take those claims into account when telling you that I can't guarantee that you won't have problems.

  • Crissa Level 1 Level 1 (5 points)
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    May 7, 2013 11:19 PM (in response to silvergc)

    I do too.  The 2009, 2010 Macbooks work with the dongle.  The 2012 does not.

     

    I've been told there is a VGA dongle but needs to be labeled 'active' but I have yet to find such a product.

     

    I'm currently using a USB video adapter.

     

    -Crissa

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