I think this is probably correct, unfortunately. Virtual machines implement screen resizing by unplugging the old virtual screen and plugging in a new virtual screen of a different resolution, to match the window size. So to gnome-shell it is a new monitor being plugged in and that should default to scale 100%.
** Changed in: gnome-shell (Ubuntu) Status: Confirmed => Won't Fix ** Changed in: gnome-shell (Ubuntu) Status: Won't Fix => Invalid ** Changed in: gnome-shell (Ubuntu) Status: Invalid => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1767342 Title: Dosplay scale factor reset after changing screen size or reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1767342/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs