Brightness goes from 1 to 2 when asking for 10% dimmer.

[christian-oudard]

    $ brightnessctl set 1
    Updated device 'intel_backlight':
    Device 'intel_backlight' of class 'backlight':
            Current brightness: 1 (0%)
            Max brightness: 512
    
    $ brightnessctl --exponent=2 set 10%-
    Updated device 'intel_backlight':
    Device 'intel_backlight' of class 'backlight':
            Current brightness: 2 (6%)
            Max brightness: 512

[christian-oudard]

Fixed in https://github.com/Hummer12007/brightnessctl/pull/80