It seems this is the same bug for Dell XPS 15 as well. Not always, but sometimes this happens either using the DA200 adapter (Type-C usb) or direct HDMI. However, a related bug has been fixed (black screen)* so I will report back if this still happens on the Dell XPS 15.
* https://bugs.freedesktop.org/show_bug.cgi?id=93578&dgc=SM&cid=60904&lid=730074515 ** Bug watch added: freedesktop.org Bugzilla #93578 https://bugs.freedesktop.org/show_bug.cgi?id=93578 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1687397 Title: Kernel freeze when plugging in external monitor via USB-C->DP-Adapter To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1687397/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs