No authentication when i reopen my laptops lid

[Samuelo]

Hello, i noticed that when i close my laptop's lid for one reason or another and then re-open it again later LL don't ask for my password like windows does.
For me that's a serious security flaw as anyone could just open the lid and then get access to laptop, how can i prevent this?
The box "Lock screen when system is going to sleep" was already checked and re-doing it changed nothing.

[stevef]

What happens if you set
System power saving - System sleep mode = Suspend
Laptop Lid - When laptop lid is closed = Lock screen
Security - Lock screen when system is going to sleep = checked

Then close lid, pause and reopen.