Intel NUC not able to drive 6 4K monitors on Ubuntu (18.10)

Asked by Stephen Kestle on 2019-07-31

I have an Intel NUC (BOXNUC8i7HVK4) with the AMD Vega M GPU, and am not able to drive 6 4K monitors with it (2 HDMI, 2 DP, 2 USB-C) - the monitors on the 2 HDMI ports are garbled, much like when a cable has connection problems.

Windows is able to drive all 6 at 4K, although the 2 HDMI ports have to drop down to 30Hz to do so.

For the moment, those monitors and I are in a period of separation - when we reunite, I'll get some info and raise a proper issue (following https://askubuntu.com/questions/492555/general-tips-strategies-for-troubleshooting-driver-issues unless I find something better)

Is this the correct forum to raise issues?
Is the above link good enough to find relevant information for a ticket?
Could there be a problem with integrated vs discrete chips? How would I tell? (I am running 6 "normal" monitors at the moment, so I can do some diagnosis)
Is there already an issue? I haven't found many trying to set up 6 monitors...

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Last query:
2019-07-31
Last reply:
2019-08-16

What is the output of:

sudo lshw -C display; lsb_release -a; uname -a; xrandr

Thanks

I truncated the resolutions - I'm pretty sure you don't need all those ;). You'll also note that I've only got 5 connected right now.

 *-display
       description: VGA compatible controller
       product: Polaris 22 [Radeon RX Vega M GH]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: /dev/fb0
       version: c0
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom fb
       configuration: depth=32 driver=amdgpu latency=0 mode=1680x1050 visual=truecolor xres=1680 yres=1050
       resources: iomemory:200-1ff iomemory:210-20f irq:141 memory:2000000000-20ffffffff memory:2100000000-21001fffff ioport:e000(size=256) memory:db500000-db53ffff memory:c0000-dffff
  *-display
       description: Display controller
       product: Intel Corporation
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 04
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm bus_master cap_list
       configuration: driver=i915 latency=0
       resources: iomemory:2f0-2ef iomemory:2f0-2ef irq:140 memory:2ffe000000-2ffeffffff memory:2fa0000000-2fafffffff ioport:f000(size=64)
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 19.04
Release: 19.04
Codename: disco
Linux sknuc 5.0.0-21-generic #22-Ubuntu SMP Tue Jul 2 13:27:33 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Screen 0: minimum 320 x 200, current 5040 x 2250, maximum 16384 x 16384
DisplayPort-0 connected 1680x1050+0+0 inverted (normal left inverted right x axis y axis) 473mm x 296mm
   1680x1050 59.88*+
   1920x1080 60.00 50.00 59.94
 ...
DisplayPort-1 connected 1680x1050+1680+0 inverted (normal left inverted right x axis y axis) 473mm x 296mm
   1680x1050 59.88*+
   1920x1080 60.00 50.00 59.94
...
DisplayPort-2 connected 1680x1050+0+1050 (normal left inverted right x axis y axis) 473mm x 296mm
   1680x1050 59.88*+
   1280x1024 75.02 60.02
...
DisplayPort-3 connected primary 1920x1200+1680+1050 (normal left inverted right x axis y axis) 518mm x 324mm
   1920x1200 59.95*+
   1920x1080 60.00 50.00 59.94
...
HDMI-A-0 connected 1680x1050+3360+0 (normal left inverted right x axis y axis) 473mm x 296mm
   1680x1050 59.88*+
   1280x1024 75.02 60.02
...
HDMI-A-1 disconnected (normal left inverted right x axis y axis)
   2160x1200 89.53 +
   1920x1200 89.53
...

DisplayPort-0 and DisplayPort-1 are the 2 USB-C ports FWIW

Launchpad Janitor (janitor) said : #4

This question was expired because it remained in the 'Open' state without activity for the last 15 days.