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#!/bin/sh
path=/sys/class/backlight/acpi_video0
luminance() {
read -r level < "$path"/actual_brightness
factor=$((100 / max))
printf '%d\n' "$((level * factor))"
}
read -r max < "$path"/max_brightness
xbacklight -set "$(luminance)"
inotifywait -me modify --format '' "$path"/actual_brightness | while read; do
xbacklight -set "$(luminance)"
done
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