Mini DisplayPort to VGA Adaptor not Mirroring

13-inch MacBook Pro (Mid 2012) running 10.8.3
Monoprice Mini DisplayPort to VGA Adaptors freeze the system (no issues with Monoprice Mini DisplayPort to DVI connected to monitor) so I tried an Apple Mini DisplayPort to VGA Adaptor and that works ok, EXCEPT it doesnt automatically mirror to projectors like older models I have used.
Is the 13-inch MacBook Pro (Mid 2012) supposed to auto mirror when connected to projectors using Mini DisplayPort to VGA Adaptor?
Thanks for any assistance.

I havent had a chance to test, yet it looks like if I create the settings for mirroring when the projector is attached to the laptop, the setting should stick moving forward.. I thought it just auto-sensed. Will try and report back here if there are any changes or to solve the ticket...

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I'm having the same problem. When I try to connect to the switch in our conference room (connecting both a flat panel display and/or a projector, both with much higher native resolutions), all I get is 640x480. This is a huge problem to using bootcamp, and I really need to get this to work. I was able to get a higher resolution 1280x800 on a separate, portable display, so I'm wondering if people have the problem with standalone projectors or only with projectors connected to some sort of switch, in my case an Extron MPX423A. I have also tried this in both Windows Vista (32-bit) and Windows 7 RC1 (32-bit), with the bootcamp drivers and the latest NVidia drivers, and the behavior is the same all around.

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Message was edited by: thomasw234

I think I know what's wrong, but I don't know of a good way to fix it. The Iiyama is not constructed correctly. It appears that it's DDC channel goes down when it's sleeping, which it shouldn't do, unless it allows auxiliary power on the VGA cable to keep the channel active, which it also seems like it isn't doing.
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null

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Hello!
Mid 2012 MacBook Pro
Processor 2.9 GHz Intel Core i7
Memory 8 GB 1600 MHz DDR3
Graphics Intel HD Graphics 4000
Software OS X 10.9.3 (13D65)
I have a mid 2012 MacBook Pro, I have connected a Mini DisplayPort to VGA Adapter in order to watch movies on a HP w19e LCD display.
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https://discussions.apple.com/message/18816392#18816392

I'm having the same problem. When I try to connect to the switch in our conference room (connecting both a flat panel display and/or a projector, both with much higher native resolutions), all I get is 640x480. This is a huge problem to using bootcamp, and I really need to get this to work. I was able to get a higher resolution 1280x800 on a separate, portable display, so I'm wondering if people have the problem with standalone projectors or only with projectors connected to some sort of switch, in my case an Extron MPX423A. I have also tried this in both Windows Vista (32-bit) and Windows 7 RC1 (32-bit), with the bootcamp drivers and the latest NVidia drivers, and the behavior is the same all around.

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Hi all,
First, thanks for your patience as I am new to these forums and thanks for reading and hopefully helping.
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Hello
I have this Problem too, my monitor best resolution is 1680 X 1050 but I can not set it, i have only 1600*1200 or 1440*1050, what can I to do?
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Emad Falsafi
Message was edited by: Emad Falsafi

HT3492 mini displayport to vga adapter not working under windows 7

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I'm having the same problem. When I try to connect to the switch in our conference room (connecting both a flat panel display and/or a projector, both with much higher native resolutions), all I get is 640x480. This is a huge problem to using bootcamp, and I really need to get this to work. I was able to get a higher resolution 1280x800 on a separate, portable display, so I'm wondering if people have the problem with standalone projectors or only with projectors connected to some sort of switch, in my case an Extron MPX423A. I have also tried this in both Windows Vista (32-bit) and Windows 7 RC1 (32-bit), with the bootcamp drivers and the latest NVidia drivers, and the behavior is the same all around.

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When you plug an external display into a new unibody MacBook Pro (15" or 17") the graphics circuitry in the computer decides whether the external display is an analog display or a digital display, based on the adaptor that you've plugged in. *It does support both analog and digital.* The Apple rep you spoke to misspoke themselves. A VGA connection is always analog, and a DVI connection is always digital.
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One more thing:
Make sure you upgrade the firmware on the mini-DisplayPort to VGA adaptor if you do indeed need to purchase one. This upgrade will show up in Software Update when you have the adaptor plugged into your MBP and is necessary for compatibility with some external displays.
If you have any further questions or require clarification please don't hesitate!
--Travis

Mini DisplayPort to VGA Adaptor not Mirroring

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