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scripts/thinkpad_x131e/brightness_down.sh

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#!/bin/bash
# brightness - on my thinkpad
max=$(cat /sys/class/backlight/intel_backlight/max_brightness)
echo "Max: $max"
min=0
echo "Min: $min"
value=250
echo "Value: $value"
actual=$(cat /sys/class/backlight/intel_backlight/actual_brightness)
echo "Actual: $actual"
future=$(($actual-$value))
if [ $future -lt 0 ]; then
future=0
fi
echo "Future: $future"
tee /sys/class/backlight/intel_backlight/brightness <<< $future