I have the same problem (negative reported DPI) when using an Ubuntu 17.10 VMWare guest running Wayland. This triggers a problem that makes it impossible to zoom in Evince (https://bugzilla.gnome.org/show_bug.cgi?id=774567). Apparently, my monitor size is detected as 0mm x 0mm.
I'd be happy to give more information, please let me know if and how I can help! Thanks! ** Bug watch added: GNOME Bug Tracker #774567 https://bugzilla.gnome.org/show_bug.cgi?id=774567 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1650192 Title: Screen DPI detected incorrectly by xdpyinfo To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1650192/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs