LG LU20 User Manual page 58

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Note:
When pressing the keys Fn + F8, it keeps unused sound device power
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management(Sound device is always ON).
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When pressing one more, it return to the original set point.
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When pressing the keys Fn + F9, it keeps unused Monitor power
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management(Monitor is always ON).
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When pressing one more, it return to the original set point.
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