I have also opened the following upstream bugreport: https://gitlab.freedesktop.org/xorg/xserver/issues/683
** Bug watch added: gitlab.freedesktop.org/xorg/xserver/issues #683 https://gitlab.freedesktop.org/xorg/xserver/issues/683 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server-hwe-16.04 in Ubuntu. https://bugs.launchpad.net/bugs/1824393 Title: Display corruption with Lenovo T450 and external monitors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server-hwe-16.04/+bug/1824393/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp