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				@@ -5,3 +5,14 @@ 
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				 ```sh 
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				 pip3 install --user --upgrade acpi-backlight 
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				 ``` 
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				+ 
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				+## usage 
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				+ 
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				+```sh 
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				+acpi-backlight-eval 1  # max brightness 
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				+acpi-backlight-eval 0.5  # 50% brightness 
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				+acpi-backlight-eval 1/4  # 25% brightness 
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				+acpi-backlight-eval 'b + 0.1' 
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				+acpi-backlight-eval 'b - 1/20' 
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				+acpi-backlight-eval 'b * 1.1' 
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				+``` 
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