How does the auto brightness work

[darky123]

When I set the phone to auto brightness it gets dimmer then the manual value that I set, but even when auto brightness is on I can still move the brightness slider and it affects the screen brightness despite it being in auto brightness mode.
I would like to know by how much percent does the screen get dimmer in auto brightness mode compared to what's set manually via the brightness slider?

 

[r56mcs]

I am seeing quite the inconsistent response from the phone as well. iPhone is much more predictable in that department.
But unlike how you described, when i move the brightness adjustment bar the auto brightness check mark disappears and the setting becomes manual.

 

[Tumultus]

I believe when auto brightness is turned on, you can use the slider to fine tune the auto brightness. Some people like it a bit darker, some a bit brighter whereas the factory auto brightness level lays right in the middle. The user manual doesn't exactly say how much brighter it gets (or darker) when moving the slider but my guess would be around +5% for maximum auto brightness and -5% for the lowest.