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1) Does the same occur if you boot from a Ubuntu 15.10 livecd?
2) What are your bios-settings regarding video outputs?
3) If you are using windows, isnt there a "force output" checkbox you could apply for that 2nd screen?
4) Is that second screen connected through hdmi?
5) Also since you are in windows, I assume you are using the latest graphics drivers for your NUC from Intel?
6) If its the hdmi output who goes dark, is that connected straight to the monitor or through some other device (including various interface converter(s))?
7) Did you try to make hdmi the primary screen in bios - would then display1 go dark (connected through hdmi, display1 as in the primary screen)?
Im thinking if some kind of hdmi handshake (encryption and stuff) could be the rootcause here?
I don't have Ubuntu set up on this computer, only Windows. I'll have to check the bios settings when I reboot, but I recall looking through the bios a while back and not seeing anything peculiar. The display that goes dark is the one that connects to the minidisplay port on the NUC. It is HDMI on the display then an adapter that goes from HDMI to mini display. I am using all the newest drivers. I looked around and don't see any "forced output" to check.
There is an additional weird thing that happens; when I open certain applications, they appear off screen (when the two displays are on as they should be). I then need to use the Shift-Windows-arrow key to get it on screen. There is certainly something screwy here.
Thanks for your input.
Thats the point of Ubuntu, you dont have to install it in order to run it.
You go to Download Ubuntu Desktop | Download | Ubuntu and download the 64-bit 15.10 version and burn that iso on a dvd and reboot your computer (make sure it boots from that dvd).
The recommendations from Apachez are helpful, they may help this situation.
I would like you to double check the different multiple displays configuration and requirements this NUC needs.
This can be found in the page 22 of the following PDF:
My other recommendation would be to use straight connections to the display (no adapters) Using HDMI to mini DP /Mini HDMI to HDMI would be the way to go.
Thanks, Esteban. While looking into the other suggestions, I was wondering if there is a particular brand of cable that you would recommend instead of using an adapter, as I am now doing. I found lots of cables, but they all seem to have a fair number of negative reviews. The Belkin model F2CD044bt12 seems OK, but still negative reviews. I'm willing to pay for a good cable if it will help.
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In order to get a high quality cable, you can go with a Gold plated cable, it would also depend on the brand, you could check if the brand chosen is reliable.
Also, make sure it is HDMI 1.4 to Mini-DP 1.2 these are the interfaces supported by the NUC.
Additionally, DP and sleep mode have known issues when waking up, here you can find an article from Microsoft for this situation.
Sorry that I did not get back to you sooner, but changing cables made it work. Since the problem was intermittent, I waited for a while to make sure that it did not happen again, and indeed, the problem has gone away.
When the system awakes, all the windows are back to the primary display, so that is still an anoying issues, but not as bad as having to change display setting each time.