[lipidfats]

Confirmed, you can turn your screen off manually by having headphones plugged in (in my case i have a miniusb adapter for a 3.5mm jack). was playing music through my car speakers a couple minutes ago. Don't know why they don't allow you to do it without headphones plugged in... guess it's a safety feature to save battery. There must be a workaround to allow manual turn off no matter which situation though.