powerdown

#!/usr/bin/env bash
# powerdown - powersave script
# please use this with xset dpms, hdparm

if [[ $EUID != 0 ]]; then
    echo "[powerdown] must be run as root"
    exit 1
fi

source /usr/lib/powerdown-functions

# bus
for i in /sys/bus/*/devices/*/power/control; do opt "$i" auto; done

# usb autosuspend
for i in /sys/bus/usb/devices/*/power/autosuspend; do opt "$i" 10; done
usb_powersave

# nmi_watchdog
opt /proc/sys/kernel/nmi_watchdog 0

# cpu
for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do opt "$i" ondemand; done
for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq; do opt "$i" 2533000; done
opt /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor 10
opt /sys/devices/system/cpu/cpufreq/ondemand/up_threshold 75
opt /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load 1

# aspm
opt /sys/module/pcie_aspm/parameters/policy powersave

# kernel write mode
opt /proc/sys/vm/laptop_mode 5
opt /proc/sys/vm/dirty_ratio 60
opt /proc/sys/vm/dirty_background_ratio 5
opt /proc/sys/vm/dirty_expire_centisecs 6000
opt /proc/sys/vm/dirty_writeback_centisecs 6000

# disk
for i in /sys/class/scsi_host/host*/link_power_management_policy; do opt "$i" min_power; done
#for dev in $(awk '/^\/dev\/sd/ {print $1}' /etc/mtab); do run mount -o remount,noatime "$dev"; done
#for dev in $(awk '/^\/dev\/sd/ {print $1}' /etc/mtab); do run blockdev --setra 4096 "$dev"; done
#for dev in $(awk '/^\/dev\/sd/ {print $1}' /etc/mtab); do run hdparm -B 1 -S 120 "$dev"; done

# sound card
opt /sys/module/snd_hda_intel/parameters/power_save 1
opt /sys/module/snd_hda_intel/parameters/power_save_controller Y
opt /sys/module/snd_ac97_codec/parameters/power_save 1

# net
for i in $(iw dev | grep Interface | cut -d ' ' -f 2); do run iw dev "$i" set power_save on; done

# screen
for i in /sys/class/backlight/*; do opt "$i/brightness" "$(brightness_scale 2 "$i")"; done

# webcam
unload_mod uvcvideo
#unload_mod videodev

# bluetooth
unload_mod btusb
unload_mod bluetooth

# open source ATI
#opt /sys/class/drm/card0/device/power_method profile
#opt /sys/class/drm/card0/device/power_profile low

# i915
opt /sys/module/i915/parameters/i915_enable_rc6 1

#KDialog deactivate programs (Skype)
if [ -z "$(pgrep skype)" ]
  then
     echo "Skype not running"
  else
     su - adriano -c "export DISPLAY=:0 && kdialog --title 'Powerdown'  --yesno 'Powerdown wants to kill Skype to save battery life.\n                  Do you want to kill Sk$
    if [ $? = 0 ]; then
            killall skype
    fi

fi

exit 0