Thanks. This sounds like a kernel bug relating to Multi-Stream Transport
(MST) over your USB-C dock. So I can only suggest two more ideas right
now:
* Avoid plugging the monitors into that dock; or
* Experiment with newer kernel versions.
** Package changed: ubuntu => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: Incomplete => New
** Summary changed:
- 3rd Monitor detected but not activated
+ 3rd Monitor detected but not activated (two connected via USB-C dock)
** Tags added: mst
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https://bugs.launchpad.net/bugs/2007180
Title:
3rd Monitor detected but not activated (two connected via USB-C dock)
Status in linux package in Ubuntu:
New
Bug description:
I have 2 external monitors, both external monitors are detected but
the display is allowing only 1 to be activated.
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gnome-shell 42.5-0ubuntu1
ProcVersionSignature: Ubuntu 5.15.0-60.66-generic 5.15.78
Uname: Linux 5.15.0-60-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Tue Feb 14 01:42:11 2023
DisplayManager: gdm3
InstallationDate: Installed on 2022-03-05 (344 days ago)
InstallationMedia: Ubuntu 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
RelatedPackageVersions: mutter-common 42.5-0ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to jammy on 2022-09-10 (156 days ago)
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