I have a relatively fresh Ubuntu 18.04 LTS installation on a Lenovo ThinkPad T580. When I put the computer in standby mode, it enters standby mode. When I wake it up again, the screen as it looked when I entered standby mode flashes briefly before the lock screen is shown. I think you have at least half a second to look at my stuff before the view changes to the lock screen. IMHO this is a security issue. Where should I report this?