Galaxy Core: How can I adjust the screen brightness on my device?
To adjust the brightness of your device's display, swipe from the top of the screen to the bottom to open the Notification Panel. The display brightness adjustment bar is shown just below the Quick Panel shortcuts. To manually adjust the brightness, touch and slide the bar to the right for a brighter screen or to the left for a darker screen.
You can also access the display settings from the Home screen by touching Apps > Settings > Display > Brightness.
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