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#!/bin/bash -e
shopt -s nullglob
case "$1" in
start)
. /etc/default/phc-intel
if [ -z "$VIDS" ]; then
echo '=> Please edit /etc/default/phc-intel'
exit 1
fi
echo ':: Setting PHC VIDs'
for i in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids; do
echo $VIDS > "$i"
done
;;
stop)
echo ':: Resetting default PHC VIDs'
for i in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids; do
cp "${i%vids}default_vids" "$i"
done
;;
status)
check_off () {
for i in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids; do
[ "$(< "$i")" = "$(< "${i%vids}default_vids")" ] || return;
done
}
check_on () {
for i in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids; do
[[ "$(< "$i")" =~ "$VIDS" ]] || return;
done
}
echo -n 'PHC status: '
. /etc/default/phc-intel
if check_off; then
echo 'inactive'
elif check_on; then
echo 'active'
else
echo 'unknown'
fi
;;
set)
. /etc/default/phc-intel
[ -z "$VIDS" ] && exit
for i in $(< /proc/cmdline); do
[ $i = nophc ] && exit
done
for i in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids; do
echo $VIDS > "$i"
done
;;
*)
echo "usage: $0 {start|stop|status|set}"
esac
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