Update backlight brightness: 40%
Update backlight brightness: 60%
Update backlight brightness: 80%
Update backlight brightness: 100%
Update backlight brightness: 0%
Update backlight brightness: 20%
Update backlight brightness: 40%
Update backlight brightness: 60%
Update backlight brightness: 80%
Update backlight brightness: 100%
Update backlight brightness: 0%
Update backlight brightness: 20%
Update backlight brightness: 40%
Update backlight brightness: 60%