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My phones screen will remain backlit and on while plugged in after getting a text or something that would pop up.
Even if nothing popped up, if I just unlock it while plugged in, it will never re-lock on its own.
This wasn't always the case but I didn't notice it for a while and am not sure what might be causing it. Maybe a background app?
Works normally when not plugged in.
Check to see if "System Settings / Developer options / Stay awake" is checked. It's intended to give exactly that behavior ("Screen will never sleep while charging").
