Target Display Mode not working iMac 27(2012) Bootcamp to iMac 27(2013)

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atmosema Author

Level 1

14 points

Target Display Mode not working iMac 27(2012) Bootcamp to iMac 27(2013)

Hi All,

I recently purchased an iMac 27" 2013 which replaced my iMac 27" 2010.

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PREVIOUS SETUP

===============

(1) iMac 27" 2012 - Running Windows 8.1

(2) iMac 27" 2010 - Running OS X Mavericks

(1)+(2) were connected with a Mini-Display-Port cable.

(1) was using (2) as external display while (2) was set to Target Display Mode using CMD+F2

==============

CURRENT SETUP

==============

(1) iMac 27" 2013 - Running Windows 8.1

(2) iMac 27" 2012 - Running OS X Mavericks

(1)+(2) are connected with Thunderbolt cable.

(1) can't use (2) as external display anymore becuase CMD+F2 has no effect anymore on (2) in this scenario.

If (1) and (2) are both running OS X all works as expected.

I am aware about the support hint from Apple where they state TDM is not working under Bootcamp.

And I agree, while booted into Windows Bootcamp this machine can't serve as external display. Makes sense because TDM is baked into OS X display drivers.

Anyone had the same experience and came to a soltuion?

Thanks,

Martin

Other OS

Posted on Dec 19, 2013 12:04 PM

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Answer 1

mende1

Level 10

93,538 points

Dec 19, 2013 12:07 PM in response to atmosema

Target Display mode is included in the iMac firmware, but it needs OS X in both Macs to work correctly, so you cannot use Target Display mode in Windows. See > http://support.apple.com/kb/HT3924?viewlocale=en_US&locale=en_US#8

There's no fix for this

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Answer 2

atmosema Author

Level 1

14 points

Dec 19, 2013 12:10 PM in response to mende1

Hi there,

I doubt that this is correct. The previous setup was working and it was both with iMacs. To me this is either a bug or on purpose. The receiving iMac does not need to know who the sender is as long as it's connected via Thunderbolt.

Thanks,

Martin

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Answer 3

mende1

Level 10

93,538 points

Dec 19, 2013 12:12 PM in response to atmosema

If you want and if you are an Apple developer, you can send this as a bug report > http://bugreport.apple.com By doing this, you may get an answer from the Apple engineering team with a much better answer than we could give you. Anyway, I doubt you will get anything, as Apple has already said it does not work

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Answer 4

atmosema Author

Level 1

14 points

Dec 19, 2013 12:13 PM in response to mende1

I am indeed a registered developer and will submit a report but wanted to hear other's experiecne and opinion. Thanks for sharing your thoughts.

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Answer 5

mende1

Level 10

93,538 points

Dec 19, 2013 12:14 PM in response to atmosema

You are welcome

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Answer 6

atmosema Author

Level 1

14 points

Jan 9, 2014 11:48 PM in response to atmosema

I got response from Developper Support and it's related to Windows Thunderbolt Drivers and the way Windows supports Thunderbolt. The reason this used to work in my "PREVIOUS SETUP" is that the older iMacs used DisplayPort for Target Display Mode. In this scenario the iMac was able to expose the panel in such a way that it looked exactly like a Display Port Device which Windows does have driver support for. Apple has no plans to implement a client driver for Windows since there is no Thunderbolt SW stack available for Windows like there is for Display Port.

So the sceanrio I describe in the opening as "CURRENT SETUP" of that discussion is indeed officially not supported.

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Answer 7

mende1

Level 10

93,538 points

Jan 9, 2014 11:51 PM in response to atmosema

Thanks for the information.

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Answer 8

Nilzj

Level 1

0 points

Mar 12, 2014 5:33 AM in response to atmosema

"Apple has no plans to implement a client driver for Windows since there is no Thunderbolt SW stack available for Windows like there is for Display Port."

That is a little bit funny since Gigabyte and other big companies have said that 2014 is the year that they are going to implement Thunderbolt in many motherboards.

"GIGABYTE 7 series motherboards are the very first to offer fully certified dual onboard Thunderbolt™ ports. Capable of connecting up to 12 devices plus 3 digital displays simultaneously with breathtaking data transfer speeds that can transfer 1TB of data in only five minutes, GIGABYTE Thunderbolt™ motherboards offer the fastest connection interface on the desktop PC."

Have you asked Apple about that? I dont understand why Apple is crippling Thunderbolt on their devices...

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