I just found out that the problem is gone if I disable IMWheel (https://wiki.archlinux.org/index.php/IMWheel).
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell-extension-ubuntu-dock in Ubuntu. https://bugs.launchpad.net/bugs/1875106 Title: System irresponsive after 2-finger horizontal scroll over dock Status in gnome-shell-extension-ubuntu-dock package in Ubuntu: New Bug description: If I do a two-finger horizontal scrolling on top of the dock/sidebar, the system becomes almost completely irresponsive: no response to keyboard, only the mouse cursor moves, but clicking anywhere has no effect. I have to close the laptop lid to force suspend, so I can control the system again. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: gnome-shell-extension-ubuntu-dock 67ubuntu20.04.5 ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30 Uname: Linux 5.4.0-26-generic x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Sat Apr 25 23:52:51 2020 InstallationDate: Installed on 2019-07-03 (297 days ago) InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) PackageArchitecture: all SourcePackage: gnome-shell-extension-ubuntu-dock UpgradeStatus: Upgraded to focal on 2020-04-25 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-ubuntu-dock/+bug/1875106/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
