/etc/apm/event.d/20hdparm is in hdparm 9.37-0ubuntu3.
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 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | #!/bin/sh
# Copyright (c) 2000-2002 Massachusetts Institute of Technology
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
set -e
# The APMD_DRIVES setting specifies the drives to be changed. Set
# this to an empty string to disable any changes.
#APMD_DRIVES=
# The spindown timeout is set to the value of APMD_SPINDOWN when the
# computer is running on battery power. When the computer is on AC
# power, the spindown timeout is disabled. The number specified here
# is encoded in a complicated way. See the man page for hdparm(8) for
# details. For small timeouts, numbers between 1 and 240 specify
# multiples of 5 seconds. So the default value of 18 means 18*5=90
# seconds, or 1.5 minutes.
APMD_SPINDOWN=18
HDPARM=/sbin/hdparm
[ -x "${HDPARM}" ] || exit 0
[ -n "${APMD_DRIVES}" ] || exit 0
for DRIVE in $APMD_DRIVES; do
[ -b "${DRIVE}" ] || exit 0
done
[ "${APMD_SPINDOWN}" -gt 0 ] || exit 0
power_conserve ()
{
# Set IDE hard disk spindown time to a short time.
for DRIVE in $APMD_DRIVES; do
"${HDPARM}" -q -S "${APMD_SPINDOWN}" "${DRIVE}" || true
done
}
power_performance ()
{
# Disable IDE hard disk spindown.
for DRIVE in $APMD_DRIVES; do
"${HDPARM}" -q -S 0 "${DRIVE}" || true
done
}
choose_power ()
{
if on_ac_power > /dev/null
then
power_performance
else
power_conserve
fi
}
if [ "${1}" = "start" ]; then
choose_power
elif [ "${1}" = "resume" ] && [ "${2}" != "standby" ]; then
choose_power
elif [ "${1},${2}" = "change,power" ]; then
choose_power
elif [ "${1}" = "stop" ]; then
power_performance
fi
exit 0
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