gistfile1.sh

ac_power() {
    echo 0 > /sys/devices/system/cpu/sched_mc_power_savings
    echo 0 > /proc/sys/vm/laptop_mode
    hdparm -B 128 -S 240 /dev/sda
    echo max_performance > /sys/class/scsi_host/host0/link_power_management_policy
    echo max_performance > /sys/class/scsi_host/host1/link_power_management_policy
    echo 1 > /sys/module/snd_hda_intel/parameters/power_save
}

battery_power() {
    echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
    echo 5 > /proc/sys/vm/laptop_mode
    hdparm -B 1 -S 12 /dev/sda
    echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
    echo min_power > /sys/class/scsi_host/host1/link_power_management_policy
    echo 10 > /sys/module/snd_hda_intel/parameters/power_save
}

case "$1" in
    false) ac_power ;;
    true) battery_power ;;
esac