[ltp] Thinkpad Power Consumption Roundup [TPCR]

[Volker Krueger]

Hi guys,

i thought it might make sense to revisit the power-consumption issue.

I realized in the meantime (I had a bit of time over eastern) how are 
things working under ubuntu. Many things are still not clear to me so I 
decided to not use laptop-mode-tools and make a powersave file myself, 
which I placed in /etc/pm/power.d

Below are powersave.sh and xorg.conf
i use the latest ubuntu version.

With these, I use right now long-term 9.1W, but short-term right now 
8.0W and 7.5W shortterm when the disk is off.

best,
Volker


/etc/pm/power.d/powersave.sh:

#!/bin/bash
if on_ac_power; then
# normal settings

  hdparm -B 200 -S 240 -M 254 /dev/sda
  mount -o remount,commit=60 /
  mount -o remount,commit=60 /home

  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 max_performance > 
/sys/class/scsi_host/host0/link_power_management_policy
  echo max_performance > 
/sys/class/scsi_host/host1/link_power_management_policy   

  modprobe e1000e
 
  echo 0 > /proc/sys/kernel/nmi_watchdog
  echo 0 > /sys/devices/system/cpu/sched_mc_power_savings
else
# Turn on power savings
  hdparm -B 1 -S 12 /dev/sda

  mount -o remount,commit=600 /
  mount -o remount,commit=600 /home

 
  echo 5 > /proc/sys/vm/laptop_mode
  echo 90 > /proc/sys/vm/dirty_ratio
  echo 1 > /proc/sys/vm/dirty_background_ratio
  echo 30000 > /proc/sys/vm/dirty_writeback_centisecs
  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 1 > /sys/devices/system/cpu/sched_mc_power_savings
  echo 0 > /proc/sys/kernel/nmi_watchdog
  echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

  echo 10 > /sys/module/snd_hda_intel/parameters/power_save

  iwconfig wlan0 power on

  echo 5 > /sys/bus/pci/drivers/iwlagn/*/power_level

  echo 5 > /proc/sys/vm/laptop_mode
 
  rmmod e1000e

fi

/etc/X11/xorg.conf
Section "Device"
    Identifier    "Configured Video Device"
        Option "AccelMethod" "UXA"
EndSection

Section "Monitor"
    Identifier    "Configured Monitor"
EndSection

Section "Screen"
    Identifier    "Default Screen"
    Monitor        "Configured Monitor"
    Device        "Configured Video Device"
EndSection