When locked, my laptop (Ideapad Y510P, with proprietary Nvidia drivers installed) screen just turns off. The laptop is still on, but I cannot access the lock screen to unlock. The only thing I can do is push the power button, which will shutdown the system. I cannot access a tty, and is unresponsive. My GPU is a GT750M. Is there any way I can fix this?
Alternately you can type the login password and click enter when you see the black screen.