runit-backlight/run

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#!/bin/sh
# Restore saved brightness for each card, if any.
for card in $(find /sys/class/backlight/ -type l); do
storage_file="/var/cache/backlight/$(basename $card)-brightness-old"
if [ -r "$storage_file" ]; then
cp "$storage_file" "$card/brightness"
fi
done
exec chpst -b backlight pause