Comment 18 for bug 1005545

I'm having the same issue in Linux Mint 16 Cinnamon.

Laptop + external monitor connected via DisplayPort. The laptop is a haswell based with Intel 4600 video card (+ nVidia Optimus - not activated right now).

When, due to inactivity, the screen saver kicks in the monitor is turned on. Later, when I move the mouse to resume the screen, instead of login window I see the last "screen-shot" before the screen saver has been activated. You still can type your password blindly and the laptop will unlock the screen, but you have to do it without seeing what you are typing or what language keyboard layout is currently active.

I'm using "uxa" acceleration method if that matters, since the new, default "sna" method is slow (i.e. try to use Expo to switch between workspaces).