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Unable to use three 4K screens (HDMI 2.0 issues)

JLoec
Beginner
1,897 Views

According to the support page https://www.intel.com/content/www/us/en/support/articles/000005571/mini-pcs.html "Setting Up Multiple Displays for the Intel® NUC", the NUC6i7KYK should be able to support three 4K screens.

I'm using Ubuntu 18.04 running Linux kernel 4.15.0-20

I'm using three LG 27UD68P-B screens (With "Super Resolution+" and "HDMI UHD Deep Color" enabled):

  1. Using the USB-C output " Displayport
  2. Using the miniDP " Displayport
  3. And the last one using a HDMI 2.0 cable from the HDMI output " HDMI input

As soon as I attach the HDMI cable things start going wrong, but each environment goes wrong a bit differently:

  • In GDM3 (the login manager) All 3 screens actually work! At 60Hz even. And I get no jitter or image corruptions.
  • When logging into Gnome Shell, only the HDMI screen will work, dragging any window will cause some mosaïque-like corruption (video below).
  • Gnome Shell using Wayland just refuses to open.
  • The Ubuntu MATE desktop interface will just mirror all 3 displays, attempting to change this will cause all 3 screens to be garbled.
  • Even using the HDMI screen at a LOWER resolution (like regular 1080p) will cause the mosaïque issue.

So how can I solve this?

0 Kudos
3 Replies
idata
Employee
253 Views

Hello skerit,

 

 

Thank you for joining the Intel Community Support.

 

 

Intel does not test and validate Intel® NUC on Linux. However, we know that a lot of Intel® NUC owners are using it successfully on many different Linux distros. I recommend you to check your Linux distro's website and forums for peer assistance with this inquiry.

 

 

Additionally, you may visit the following website: https://01.org/linuxgraphics

 

 

Wanner G.
JLoec
Beginner
253 Views

I was afraid of that But just to make sure: the device should be able to use three 4K screens, right?

idata
Employee
253 Views

Hello skerit,

 

 

You are right. The Intel® NUC Kit NUC6i7KYK supports three 4K displays, but you have to connect one display per video port.

 

 

As you already mentioned, the following configuration is recommended under Triple Display Configurations:

 

https://www.intel.com/content/www/us/en/support/articles/000005571/mini-pcs.html

 

 

I hope this helps.

 

 

Wanner G.
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