mirror of https://github.com/captn3m0/Scripts.git
27 lines
653 B
Bash
Executable File
27 lines
653 B
Bash
Executable File
#!/bin/bash
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# base dir for backlight class
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basedir="/sys/class/backlight/"
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# get the backlight handler
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handler=$basedir$(ls $basedir)"/"
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# get current brightness
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old_brightness=$(cat $handler"brightness")
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# get max brightness
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max_brightness=$(cat $handler"max_brightness")
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# get current brightness %
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old_brightness_p=$(( 100 * $old_brightness / $max_brightness ))
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# calculate new brightness %
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new_brightness_p=$(($old_brightness_p $1))
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# calculate new brightness value
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new_brightness=$(( $max_brightness * $new_brightness_p / 100 ))
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# set the new brightness value
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sudo chmod 666 $handler"brightness"
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echo $new_brightness > $handler"brightness"
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