Public bug reported:
https://www.intel.com/content/www/us.../mini-pcs.html
claims that the Skull Canyon ( NUC6i7KYK ) can handle three 4k displays, so
I'm experimenting with a Skull Canyon running a fresh minimal Ubuntu 18.04.
It works great when plugged into one 4k monitor (via any of the three
ports: hdmi, mini-dp, or type c; all three show up in xrandr as DisplayPort).
It even seems to work ok when I plug in two. Doesn't matter which two.
When I plug in all three, and boot to normal graphical.target mode with the
usual gdm
greeter, one of the three screens does show gdm, and allows me to log in.
But I can't seem to get all three screens active at the same time.
Falling back to old school tools, I did 'sudo systemctl set-default
multi-user.target'
and rebooted. Logging in, creating a trivial .xinitrc, and doing 'startx'
started the X server, and all three screens show the same output.
So far so good.
But trying to arrange them like this:
$ xrandr --auto --output DP-2 --right-of DP-1 --output DP-3 --right-of
DP-2
fails with
xrandr: screen cannot be larger than 8192x8192 (desired size 11520x2160)
Using --above instead of --right-of works, but that's not how the
monitors are arranged.
I tried creating /usr/share/X11/xorg.conf.d/85-screen.conf
containing
Section "Screen"
Identifier "Default Screen"
DefaultDepth 24
SubSection "Display"
Virtual 11520 6480
EndSubSection
EndSection
and applied it by killing X and doing startx again,
but that gave very strange results: the mouse showed up on two
screens, but .xinit didn't seem to have taken effect, and the
content on the screen was the same as before startx.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xserver-xorg-core 2:1.19.6-1ubuntu4
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Mon Jun 11 09:49:40 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation Iris Pro Graphics 580 [8086:193b] (rev 09) (prog-if 00 [VGA
controller])
Subsystem: Intel Corporation Iris Pro Graphics 580 [8086:2064]
InstallationDate: Installed on 2018-06-08 (2 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-22-generic
root=UUID=80ac733c-b098-4643-84a4-fe81874f2101 ro rootflags=subvol=@ quiet
splash vt.handoff=1
SourcePackage: xorg-server
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/03/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: KYSKLi70.86A.0037.2016.0603.1032
dmi.board.name: NUC6i7KYB
dmi.board.vendor: Intel Corporation
dmi.board.version: H90766-404
dmi.chassis.type: 3
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrKYSKLi70.86A.0037.2016.0603.1032:bd06/03/2016:svn:pn:pvr:rvnIntelCorporation:rnNUC6i7KYB:rvrH90766-404:cvnIntelCorporation:ct3:cvr1.0:
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic ubuntu
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1776260
Title:
Can't use three monitors properly; "xrandr: screen cannot be larger
than 8192x8192"
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1776260/+subscriptions
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