Installed the Intel Graphics for Linux (Intel Graphics Update Tool for Linux* OS v2.0.2 | 01.org)
Rebooted but it didnt seem to help. Running xrandr -q revealed some interesting info, system seems to think its connected by DisplayPort (DP1) instead of HDMI and my 4K seems to be limited to 30 Hz.
$ xrandr -d :0 -q Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767 DP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 708mm x 399mm 3840x2160 30.00 + 30.00 25.00 24.00 29.97 23.98 24.00 2560x1440 59.95 1920x1200 59.95 1920x1080 60.00* 50.00 59.94 1920x1080i 60.00 50.00 59.94 1600x1200 60.00 1680x1050 59.88 1280x1024 75.02 60.02 1440x900 59.90 1280x960 60.00 1152x864 75.00 1280x720 60.00 50.00 59.94 1440x576 50.00 1024x768 75.08 70.07 60.00 1440x480 60.00 59.94 800x600 72.19 75.00 60.32 56.25 720x576 50.00 720x480 60.00 59.94 640x480 75.00 72.81 60.00 59.94 720x400 70.08 DP2 disconnected (normal left inverted right x axis y axis) DP3 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) HDMI3 disconnected (normal left inverted right x axis y axis) VIRTUAL1 disconnected (normal left inverted right x axis y axis)
Anyone who got 4K working on NUC6i7KYK, was it plug and play? Are you using HDMI 2.0 or DisplayPort?
edit: Seems like HDMI 2.0 hasn't been working since 28 Aug 2016 - intel graphics - No HDMI 2.0 output from NUC6i7KYK on 16.04 -- fixes? - Ask Ubuntu
I'll try to roll back to 4.2 kernel with 16.04 to see if I have any luck..
Look like the Asus PA328Q can only do YCbCr 4:2:0 color format on HDMI 2.0 @ 60Hz -- this doesnt mesh well hence the blue color.
I tried the other ports and it wont even let me get 4K@30Hz,
Luckily, its works using the mini DisplayPort at 4K@60hz.
Sadly Linux VPU decoding needs much work, fans spinning decoding 4K using:
- Totem ~150% CPU
- VLC gives frequent black screens making it unusable.
- mplayer seems OK but maxes out 1-2 cores
They all seem to be dropping frames due software decoding but thats another issue.
Gonna try Windows 10.
So I installed Win 10 Pro and was able to get 4K@60Hz over HDMI 2.0 using the same monitor and cable and everything so it seems likes its Ubuntu 16.04 drivers or kernel or something else in that stack..
edit: VLC runs buttery smooth - no skipped frames @ 23% processor usage full screen. Fans still spin up but this experience is WAAAAY better than on Ubuntu. Its night and day.
edit^2: More research, looks like YCbCr 4:2:0 is possible in Ubuntu but not implemented YCbCr 4:2:0 over HDMI | 01.org
This message was posted on behalf of Intel Corporation
In regard to your graphic issue with Ubuntu, Intel does not test and validate Intel® NUC on Linux; however, we know that a lot of NUC owners are using it successfully on many different Linux distros.
Intel suggests you check your Linux distro's website and forums at [https://www.ubuntu.com/about/contact-us] for peer assistance with this issue.
Also, I would like to confirm if when you run Windows on your NUC, did you have the same issues? If there was the same or another different issue with Windows, please let me know all the details.
Please let me know how it goes.