20hdparm

电源管理程序

#!/bin/sh

# Copyright (c) 2000, 2001 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

export PATH=/bin:/usr/bin:/sbin:/usr/sbin

HDPARM=/sbin/hdparm
[ -x "${HDPARM}" ] || exit 0

HDPARM_DRIVE=none
HDPARM_SPINDOWN=0
[ ! -r /etc/apm/apmd_proxy.conf ] || . /etc/apm/apmd_proxy.conf

[ -z "${HDPARM_DRIVE}" -o "${HDPARM_DRIVE}" = "none" ] && exit 0
[ -b "${HDPARM_DRIVE}" ] || exit 0
[ "${HDPARM_SPINDOWN}" -gt 0 ] || exit 0

power_conserve ()
{
    # Set IDE hard disk spindown time to a short time.
    "${HDPARM}" -q -S "${HDPARM_SPINDOWN}" "${HDPARM_DRIVE}" || true
}

power_performance ()
{
    # Disable IDE hard disk spindown.
    "${HDPARM}" -q -S 0 "${HDPARM_DRIVE}" || true
}

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