ubuntu-22.04.3-desktop-amd64/casper/filesystem/etc/acpi/undock.sh

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#!/bin/sh
test -f /usr/share/acpi-support/key-constants || exit 0
for device in /sys/devices/platform/dock.*; do
[ -e "$device/type" ] || continue
[ x$(cat "$device/type") = xdock_station ] || continue
echo 1 > "$device/undock"
done