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Using the Q Menu's Backlight Control
You can adjust even more settings using the Q Menu. Tap the Q icon on the taskbar, then tap Backlight. (If the Q icon does not appear on your taskbar, tap StartàQLaunch.)
Backlight Menu
You can perform the following actions:
Tap High to set the backlight brightness to high.
Tap Low to set the backlight brightness to low.
Tap Off to turn off the backlight.
Tap Disable to turn off the backlight and remove the light bulb icon from the taskbar.