I just reinstalled xfce4-mcs-plugins and the display configuration works. It's definitely xfconf bug.
-- xfce4-display-settings do not apply changes https://bugs.launchpad.net/bugs/331751 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs