by Mark & more
TOGGLE [T] this flow on/off via the START (never the STOP) button! This allows you to control its state from the widget on your home screen (which doesn't have a STOP button).
When you set your screen brightness to 0 or unlock your phone, the brightness is adjusted depending on the ambient light level.
On startup, you will get a volume popup. If you would like the flow to automatically adjust volume in real-time, press vol-down and set a difference. Setting it to 0 will constantly adjust your brightness, setting it to something higher will require there to be a difference between your brightness and the ambient light level of at least the number you chose (in %).