Current File : //lib/pm-utils/power.d/95hdparm-apm
#! /bin/sh
#
# This script adjusts hard drive APM settings using hdparm. The hardware
# defaults (usually hdparm -B 127) cause excessive head load/unload cycles
# on many modern hard drives. We therefore set hdparm -B 254 while on AC
# power. On battery we set hdparm -B 128; this still does not guarantee
# disk parking, but is safer than causing lots of mechanical wear on disks
# as we seem to get currently with 127.
#
# Refactored from acpi-support's 90-hdparm.sh for pm-utils
if grep -wq "nohdparm" /proc/cmdline ; then
exit 0
fi
# Do nothing when called via /etc/init.d/acpi-support; udev rules take care
# of setting the initial hdparm policy for us.
if ([ "$previous" ] && [ "$runlevel" ]) || [ "$runlevel" = S ]; then
exit 0
fi
if [ -e /usr/sbin/laptop_mode ] ; then
LMT_CONTROL_HD_POWERMGMT=$(. /etc/laptop-mode/laptop-mode.conf && echo "$CONTROL_HD_POWERMGMT")
if [ "$LMT_CONTROL_HD_POWERMGMT" != 0 ] \
&& [ -e /var/run/laptop-mode-tools/enabled ]
then
# Laptop mode controls hdparm -B settings, we don't.
exit 0
fi
fi
. /lib/hdparm/hdparm-functions
resume_hdparm_apm()
{
for dev in /dev/sd? /dev/hd? ; do
apm_opt=
if [ -b $dev ] && hdparm_try_apm $dev ; then
for option in $(hdparm_options $dev); do
case $option in
-B*)
apm_opt=$option
;;
*)
;;
esac
done
if [ -n "$apm_opt" ]; then
hdparm $apm_opt $dev
fi
fi
done
}
resume_hdparm_spindown()
{
for dev in /dev/sd? /dev/hd? ; do
# Check for force_spindown_time option
# If defined apply hdaprm -S even if APM is not supported
# See also #758988
ignore_apm=
options=$(hdparm_options $dev)
case $options in
(*'force_spindown_time'*)
ignore_apm='true'
;;
esac
apm_opt=
if [ -b $dev ]; then
if hdparm_try_apm $dev || [ "$ignore_apm" = true ] ; then
for option in $(hdparm_options $dev); do
# Convert manually introduced option "force_spindown_time"
# back to "-S" understandable by hdparm
option=$(echo $option| sed 's/force_spindown_time/-S/')
case $option in
-S*)
apm_opt=$option
;;
*)
;;
esac
done
if [ -n "$apm_opt" ]; then
hdparm $apm_opt $dev
fi
fi
fi
done
}
case "$1" in
true|false) # powersaving on/off
resume_hdparm_apm
;;
thaw|resume)
resume_hdparm_apm
# only set the -S option on resuming, not necessary for power.d
resume_hdparm_spindown
;;
*)
exit 254
;;
esac
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