Can't use three monitors properly; "xrandr: screen cannot be larger than 8192x8192"
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
X.Org X server |
Unknown
|
Unknown
|
|||
xorg-server (Ubuntu) |
Incomplete
|
Undecided
|
Unassigned |
Bug Description
https:/
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/
containing
Section "Screen"
Identifier "Default Screen"
SubSection "Display"
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
ProcVersionSign
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CompizPlugins: No value set for `/apps/
CompositorRunning: None
Date: Mon Jun 11 09:49:40 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingI
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=
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.
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.
dmi.modalias: dmi:bvnAmerican
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.91-2
version.
version.
version.
version.
version.
version.
version.
Sorry, that Intel URL should have been https:/ /www.intel. com/content/ www/us/ en/support/ articles/ 000005571/ mini-pcs. html