Public bug reported: This bug is fixed in version 0.28.1, which is shipped with Cosmic. I am requesting this be backported to Bionic. I know this was fixed relatively recently, so I'm not sure if it's "in the queue" or not.
Here is the libinput bug report: https://gitlab.freedesktop.org/libinput/libinput/issues/153 Here is the commit that fixes the bug: https://gitlab.freedesktop.org/xorg/driver/xf86-input- libinput/commit/a759610292a53067fc811e70703bffff8dc0cb16 I have verified that installing the following debs from Cosmic fixes the issue I am seeing: libinput-bin 1.12.1-1 libinput10:amd64 1.12.1-1 xserver-xorg-input-libinput 0.28.1-1 ** Affects: xserver-xorg-input-libinput (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-input-libinput in Ubuntu. https://bugs.launchpad.net/bugs/1804029 Title: Touching on multiple touchscreens simultaneously breaks X11 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-libinput/+bug/1804029/+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