OK, so I think I can now answer my question myself.
As far as I can see it is nowhere shown in the Intel documentation or web site, but on the backside of the D54250WYKH the DisplayPort logo is as shown here: DisplayPort - Wikipedia, the free encyclopedia which means it must be DisplayPort++
But I would still appreciate a confirmation from Intel.
Hmmm... I am in doubt again on this. The picture of the back-side of the D54250WYKH in the Intel Integration Guide version 2 clearly shows the DisplayPort++ logo:
But on a real photograph that I see at a web shop there is no official DisplayPort logo:
So the question is not yet answered.
Is anybody using a DisplayPort to HDMI adapter with a D54250WYKH or comparable unit?
OK, another update on this: I just received my D54250WYKH, and on its backside indeed the official DisplayPort++ logo is shown:
So in the end it looks like it will be possible to use a simple passive DP to HDMI adapter.
My D54250WYKH is a version H26246-102 from batch CNG643P203 and manufacturing date 25MAR2014.
However, I would still appreciate response from Intel and/or other users for confirmation before I buy such an adapter.
What I still am not sure about is whether using this kind of adapter is solely depending on compatible hardware (which my D54250WYKH probably is), or that it also depends on software (OS and/or drivers).
Hello Schrand, thanks for contacting us through the Intel communities.
First of all it is important to have in mind that we guarantee the functionality of our products when using straight connections from the device to the displayed devices.
This picture will show you the information about the Mini Display port that comes on your NUC.
I few weeks ago we received some comments from customers reporting audio issues when using an AV receiver. The following forum will give you additional information on this https://communities.intel.com/message/218663#218663
Thank you Sylvia for your response.
The information that you gave in your response was already known to me, but the specific DisplayPort++ or Dual-mode is not mentioned there.
This is how I understand it now:
DisplayPort and HDMI are completely different signals that are not compatible.
There are active adapters available that translate DisplayPort signals into HDMI signals and vice-versa.
However, using the Dual-mode or DisplayPort++ option, the device (the NUC in this case) will send a native HDMI signal from specific contacts of the the DisplayPort connector, which can be directly transfered to a normal HDMI connector using a passive adapter.
The logo shown on my D54250WYKH suggests that it supports the DisplayPort++ opion. So my question is: is this indeed the case, and if so, are there any additional software requirements (OS and/or drivers).
I hope this is clear now, and am looking forward to your response.
Thank you again Sylvia for your answer, and sorry for my late response.
However, I think it is still not completely clear, because you don't mention the specific DisplayPort++ option, and you don't say whether the adapter can be passive or must be active.
So one more try:
Can you please confirm that the D54250WYKH supports DisplayPort++ (or Dual-mode), so that I can use a passive DP-to-HDMI adapter.
Regarding the software: I am using Windows 8.1 64bit with the latest available drivers, so that should be OK.
Is there any change on a definitive answer to this question?
Up to now the only indication about the D54250WYKH supporting DisplayPort++ is the logo on the backside of it; it is nowhere else specified (not in any Intel spec or Intel website as far as I can find).
So please Intel, can you look into this, and let us know whether or not a passive DP-to-HDMI adapter will work with the D54250WYKH (and similar NUCs)?