#!/bin/sh # # This shell script if placed in /etc/apcupsd will be # called by /etc/apcupsd/apccontrol when the UPS goes # back on to the mains after a power failure. # # We scale the CPU clock frequency to maximum and # send an email message to root to notify him. # # NOTE: Assumes Linux-2.6.x kernel with CPUFREQ # support for your chipset. SYSADMIN=root APCUPSD_MAIL="/bin/mail" # Iterate over all CPUs, enabling the userspace governor # and programming the current clock speed to the maximum. # This is redundant on hyperthread siblings, but it # doesn't hurt anything and it keeps the code simple. for CPU in /sys/devices/system/cpu/cpu*/cpufreq ; do echo -n userspace > $CPU/scaling_governor cat $CPU/scaling_max_freq > $CPU/scaling_setspeed done # Send an email to root HOSTNAME=`hostname` MSG="$HOSTNAME Power has returned" # ( echo "Subject: $MSG" echo " " echo "$MSG" echo " " for CPU in `ls -1 /sys/devices/system/cpu` ; do echo -n "$CPU freq scaled to " cat /sys/devices/system/cpu/$CPU/cpufreq/scaling_setspeed | tr -d '\n' echo " MHz" done echo " " /sbin/apcaccess status ) | $APCUPSD_MAIL -s "$MSG" $SYSADMIN exit 0