I experienced the same issue on my Dell XPS 13 (9350) running Kubuntu 18.10 (4.18.0-25-generic), KDE Plasma 5.13.5. My laptop was connected to the 2nd monitor using the VGA port on the Dell 4-in-1 adapter with the DisplayLink driver 5.2.14
I followed the comment in this link (https://github.com/DisplayLink/evdi/issues/29#issuecomment-479529359) and mannually added /usr/share/X11/xorg.conf.d/21-displaylink.conf file with the content below: Section "Device" Identifier "DisplayLink" Driver "modesetting" Option "PageFlip" "false" EndSection After rebooting, the mouse no longer flickers when connecting to the 2nd monitor using the DisplayLink adapater so it could be a solution for this problem. ** Bug watch added: github.com/DisplayLink/evdi/issues #29 https://github.com/DisplayLink/evdi/issues/29 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1724307 Title: [Dell XPS 13 9360] Mouse cursor flickers with one external monitor connected via HDMI+Wavlink WL-UG39DK1V To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1724307/+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
