I have recently migrated to Lumia 650 from Lumia 635. On Lumia 635 / Windows 8.1, when I pressed power button, screen was turned off completely and I could visually confirm that it turned off and it is not showing black pixels.
When I do the same with Lumia 650 / Windows 10, when I press power button, screen turns entirely black (but it is still turned on) with dark-white letters showing current date and time. Screen turns off completely after something around 20-30 minutes or so.
This is quite very annoying to me and yet I can find any option in settings to disable this feature and to force my phone to really turn off screen immediately after I press power button. Or to reduce time phone is in this mode to an absolute minimum.
Am I blind and this option is there, somewhere? Or isn't another feature in Windows / Lumia which Microsoft thinks, I can't live without and thus disallows me from turning it off or changing its behavior?