/etc/acpi/asus-keyboard-backlight.sh is in acpi-support 0.142.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #!/bin/sh
# this directory is a symlink on my machine:
KEYS_DIR=/sys/class/leds/asus\:\:kbd_backlight
test -d $KEYS_DIR || exit 0
MIN=0
MAX=$(cat $KEYS_DIR/max_brightness)
VAL=$(cat $KEYS_DIR/brightness)
if [ "$1" = down ]; then
VAL=$((VAL-1))
else
VAL=$((VAL+1))
fi
if [ "$VAL" -lt $MIN ]; then
VAL=$MIN
elif [ "$VAL" -gt $MAX ]; then
VAL=$MAX
fi
echo $VAL > $KEYS_DIR/brightness
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