#!/bin/sh
# A script to enable laptop power saving features for #! & Debian GNU+linux.
# http://crunchbanglinux.org/forums/topic/11954

# List of modules to unload, space seperated. Edit depending on your hardware and preferences.
modlist="uvcvideo btusb"
# Bus list for runtime pm. Probably shouldn't touch this.
buslist="pci spi i2c"

case "$1" in
    true)
    # Enable some power saving settings while on battery
    #touch /home/marlock/pm-utils-powersave-battery
       # Enable laptop mode
        echo 5 > /proc/sys/vm/laptop_mode
       # Less VM disk activity. Suggested by powertop
        echo 90 > /proc/sys/vm/dirty_ratio
    echo 1 > /proc/sys/vm/dirty_background_ratio
    echo 60000 > /proc/sys/vm/dirty_writeback_centisecs
       # Intel power saving
        echo Y > /sys/module/snd_hda_intel/parameters/power_save_controller
        echo 1 > /sys/module/snd_hda_intel/parameters/power_save
        echo powersave > /sys/module/pcie_aspm/parameters/policy
        /usr/bin/iw wlp3s0 set power_save on
       # Set backlight brightness to 50%
        #echo 1200 > /sys/class/backlight/intel_backlight/brightness
       # USB powersaving
        for i in /sys/bus/usb/devices/*/power/autosuspend; do
            echo 1 > $i
        done
        for i in /sys/bus/usb/devices/*/power/control; do
            echo auto > $i
        done
       # SATA power saving
        for i in /sys/class/scsi_host/host*/link_power_management_policy; do
            echo min_power > $i
        done
       # Disable hardware modules to save power
        for mod in $modlist; do
            grep $mod /proc/modules >/dev/null || continue
            modprobe -r $mod 2>/dev/null
        done
       # Enable runtime power management. Suggested by powertop.
        for bus in $buslist; do
            for i in /sys/bus/$bus/devices/*/power/control; do
                echo auto > $i
            done
        done
    ;;
    false)
       #Return settings to default on AC power
    #touch /home/marlock/pm-utils-powersave-ACpower
        echo 0 > /proc/sys/vm/laptop_mode
    echo 10 > /proc/sys/vm/dirty_ratio
    echo 5 > /proc/sys/vm/dirty_background_ratio
        echo 500 > /proc/sys/vm/dirty_writeback_centisecs
        echo N > /sys/module/snd_hda_intel/parameters/power_save_controller
        echo 0 > /sys/module/snd_hda_intel/parameters/power_save
        echo default > /sys/module/pcie_aspm/parameters/policy
        /usr/bin/iw wlp4s0 set power_save off
        #echo 1200 > /sys/class/backlight/intel_backlight/brightness
        for i in /sys/bus/usb/devices/*/power/autosuspend; do
            echo 2 > $i
        done
        for i in /sys/class/scsi_host/host*/link_power_management_policy
            do echo max_performance > $i
        done
        for mod in $modlist; do
            if ! lsmod | grep $mod; then
                modprobe $mod 2>/dev/null
            fi
        done
        for bus in $buslist; do
            for i in /sys/bus/$bus/devices/*/power/control; do
                echo on > $i
            done
        done
    ;;
esac

exit 0