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#! /bin/sh
#
# This script adjusts hard drive APM settings using hdparm. The hardware
# defaults (usually hdparm -B 128) 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, because the head parking is
# very useful for shock protection.
#
. /usr/share/acpi-support/power-funcs
DO_HDPARM=y
if [ -e /usr/sbin/laptop_mode ] ; then
LMT_CONTROL_HD_POWERMGMT=$(. /etc/laptop-mode/laptop-mode.conf && echo "$CONTROL_HD_POWERMGMT")
if [ "$LMT_CONTROL_HD_POWERMGMT" != 0 ] \
&& [ -e /var/run/laptop-mode-tools/enabled ]
then
# Laptop mode controls hdparm -B settings, we don't.
DO_HDPARM=n
fi
fi
if [ "$DO_HDPARM" = y ] ; then
# Get the power state into STATE
getState;
for dev in /dev/sd? /dev/hd? ; do
if [ -b $dev ] ; then
# Check for APM support; discard errors since not all drives
# support HDIO_GET_IDENTITY (-i).
if hdparm -i $dev 2> /dev/null | grep -q 'AdvancedPM=yes' ; then
if [ "$STATE" = "BATTERY" ] ; then
hdparm -B 128 $dev
else
hdparm -B 254 $dev
fi
fi
fi
done
fi
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