yeah you were right, DP-1 is owned by the intel chip, so closing as fixed by the kernel update
** Package changed: xserver-xorg-video-nouveau (Ubuntu) => xserver-xorg- video-intel (Ubuntu) ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1130938 Title: Black screen after resuming from suspend [Dell XPS 15z] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1130938/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs