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nixos-hardware/apple/t2/fix-keyboard-backlight-and-touchbar.sh

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#!/bin/sh
set -eux
unload () {
if modprobe -r "$1" 2>&1;
then echo ok
else echo fail
fi
}
wait_unload() {
while sleep 1; do
output="$(unload "$1")"
case "$output" in
*is\ in\ use*) :;;
*ok*) return 0;;
*) echo "modprobe said: $output"; echo giving up; return 1;
esac
done
}
wait_unload apple_touchbar
modprobe apple_touchbar
# After suspend, the inode for the backlight device has changed. This service
# simply restarts upower to inform it of that change.
systemctl restart upower.service