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I have two 4K Monitors connected to a single DisplayPort 1.4 Output via
a DisplayPort 1.4 MST Hub working flawlessly under X.org.
I have enabled nvidia-drm.modeset=1 in the GRUB CMDLINE Settings and
switched to Wayland in the GDM Greeter.
But it seems like Wayland is unable to drive multiple displays via a
DisplayPort 1.4 MST Hub, because only one of them shows a display
output. However they are both correctly recognized under the display
settings.
ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: xorg 1:7.7+22ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
Uname: Linux 5.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia zfs zunicode zavl icp zcommon
znvpair
.proc.driver.nvidia.capabilities.gpu0: Error: path was not a regular file.
.proc.driver.nvidia.capabilities.mig: Error: path was not a regular file.
.proc.driver.nvidia.gpus.0000.2a.00.0: Error: path was not a regular file.
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
.proc.driver.nvidia.version:
NVRM version: NVIDIA UNIX x86_64 Kernel Module 470.63.01 Tue Aug 3 20:44:16
UTC 2021
GCC version:
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 7 15:05:07 2021
DistUpgraded: Fresh install
DistroCodename: impish
DistroVariant: ubuntu
DkmsStatus: zfs, 2.0.6, 5.13.0-16-generic, x86_64: installed (WARNING! Diff
between built and installed module!)
ExtraDebuggingInterest: Yes
GraphicsCard:
NVIDIA Corporation GA102 [GeForce RTX 3080 Ti] [10de:2208] (rev a1) (prog-if
00 [VGA controller])
Subsystem: NVIDIA Corporation GA102 [GeForce RTX 3080 Ti] [10de:1535]
InstallationDate: Installed on 2021-10-07 (0 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Daily amd64 (20211006)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu_10kpab@/vmlinuz-5.13.0-16-generic
root=ZFS=rpool/ROOT/ubuntu_10kpab ro quiet splash nvidia-drm.modeset=1
vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/11/2021
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P3.20
dmi.board.name: X570 Phantom Gaming-ITX/TB3
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrP3.20:bd08/11/2021:br5.17:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:skuToBeFilledByO.E.M.:rvnASRock:rnX570PhantomGaming-ITX/TB3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
nvidia-settings:
ERROR: Unable to find display on any available system
ERROR: Unable to find display on any available system
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.107-8
version.libgl1-mesa-dri: libgl1-mesa-dri 21.2.2-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.13-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200714-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-1
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug impish ubuntu wayland-session
--
DisplayPort MST Hub only recognizes one of two displays using Wayland (NVIDIA)
https://bugs.launchpad.net/bugs/1946367
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