I can add that the same behavior happens under xorg, gnome shell ubuntu 17.10 latest update. editing monitors.xml also is ignored it seems. the bug affects GDM mmonitors.xml as well.
** Summary changed: - Method ApplyConfiguration is not implemented on interface org.gnome.Mutter.DisplayConfig + Can't change display configuration, Method ApplyConfiguration is not implemented on interface org.gnome.Mutter.DisplayConfig -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1714410 Title: Can't change display configuration, Method ApplyConfiguration is not implemented on interface org.gnome.Mutter.DisplayConfig To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1714410/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs