Screen Dimming still - after unchecking 'ambient brigthness settings

I've turned off the ambient light settings under display, but still the screen dims then turns off, while on AC power.
How do I turn this off so that the brightness stays as is! (And just let the screen saver kick in as set)
Please help.
Thanks!

Systems Preferences | Energy Saver | Options
DeSelect automatically reduce the brightness of the display before display sleep

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