steam-deck-tools/PowerControl/Options/Brightness.cs

namespace PowerControl.Options
{
    public static class Brightness
    {
        public static Menu.MenuItemWithOptions Instance = new Menu.MenuItemWithOptions()
        {
            Name = "Brightness",
            Options = { 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 },
            CycleOptions = false,
            CurrentValue = delegate ()
            {
                return Helpers.WindowsSettingsBrightnessController.Get(5.0);
            },
            ApplyValue = delegate (object selected)
            {
                Helpers.WindowsSettingsBrightnessController.Set((int)selected);

                return Helpers.WindowsSettingsBrightnessController.Get(5.0);
            }
        };
    }
}