00_intel_pstate

#!/bin/sh

# on Ubuntu 14.04, set a pm-hibernate resume hook
# which is placed in /etc/pm/sleep.d/00_intel_pstate

# it sets up CPU intel pstate appropriately, which by default
# gets ruined by being scaled down to 50% of max CPU without the
# easy ability to change it back; also sets governor to performance
# for good measure, since apparently default is "powersave"

# I also recommend you do `sudo touch /etc/pm/sleep.d/94cpufreq` in order
# to disable the resume hook for cpu frequency scaling if you are using
# this Intel driver, as is now recommended

case "${1}" in
    resume|thaw)
        # sleep is necessary because Linux stinks
        sleep 10
        # set turbo mode and 100% of CPU scaling capability
        echo 0 >/sys/devices/system/cpu/intel_pstate/no_turbo
        echo 100 >/sys/devices/system/cpu/intel_pstate/max_perf_pct
        # switch to "performance" governor
        for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
        do
            [ -f $CPUFREQ ] || continue
            echo -n "performance" >$CPUFREQ
        done
esac