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
lock

# 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" powersave; done
load_mod msr
run x86_energy_perf_policy powersave

# 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 90
opt /proc/sys/vm/dirty_background_ratio 1
opt /proc/sys/vm/dirty_expire_centisecs 60000
opt /proc/sys/vm/dirty_writeback_centisecs 60000

# 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 | awk '$1 == "Interface" { print $2 }'); do run iw dev "$i" set power_save on; done
run ethtool -s eth0 wol d

# screen
for i in /sys/class/backlight/*; do opt "$i/brightness" "$(num_scale "$i/max_brightness" 1)"; done

# webcam
unload_mod_recursive videodev

# bluetooth
unload_mod_recursive bluetooth

# open source ATI
opt /sys/kernel/debug/vgaswitcheroo/switch OFF
for i in /sys/class/drm/card*/device/power_method; do opt "$i" profile; done
for i in /sys/class/drm/card*/device/power_profile; do opt "$i" low; done
for i in /sys/class/drm/card*/device/power_dpm_state; do opt "$i" battery; done

# i915
#opt /sys/module/i915/parameters/i915_enable_rc6 1
exit 0