I am also using VGA and don't have any detection problems. I don't know if I have the same issue as OP though.
Here is a picture of my issue (attachment). ** Attachment added: "wrong size and flickering" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1634220/+attachment/4763816/+files/Capture%20du%202016-10-19%2017-52-19.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1634220 Title: Wallpaper does not resize correctly when adding external display To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1634220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs