How to recover completely darkened screen on Moto G (Lollipop) due to setting brightness to zero? I have Moto G on Lollipop, and I mistakenly set the brightness bar to zero. Now, the screen is completely darkened and I'm not able to see anything.

How to set back the brightness to usable mode without hitting factory reset?
Had same problem.  I believe the adaptive brightness auto adjust it to zero light.
I use another phone flash light and direct it on the the front camera and light sensor. Unlocking with power button awaken my screen with adjusted brightness.. 
Hope this will help...