I don't know the capabilities of the USB-C port you're using, or the model of dock you're using. But I would not be surprised if this is some bottleneck whereby the combination of this particular USB-C port and this particular dock do not have enough bandwidth to drive two 3440x1440 monitors at the same time.
Maybe it works on Windows due to better bandwidth management or just because this is a Linux bug that we haven't narrowed down yet. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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: Incomplete 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2007180/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
