The suspend option of the KDE4 start menu (currently kickoff style) doesn't even offer locking the screen during a suspend/resume cycle, moreover the KDE4 counterpart of kpowersave also fails to lock the screen despite promising to do so (it's configured to do so, and even gives me a popup which tells that the screen was locked). It only locks the screen it the laptop lid triggers the suspension, however suspension is mostly onsuccesful (maybe because of the kernel).

I assume, KDE should alway lock the screen BEFORE suspending/hibernating, when configured to do so. Even when the suspend is triggered by the KDE start menu, because letting the screen unlocked may be very unsecure.