this issue also effects me with 16.04 on 4k version of the same laptop and an external 4k screen running on displayport. It seems like the screens are not woken up fast enough and timeout causing the windows to be moved from them. I wonder if the timeouts could be adjusted upwards for high res screens.
it has got worse since 15.10 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1574251 Title: Resuming from screen lock with a multimonitor setup causes all windows to migrate to the "primary screen" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1574251/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
