Laptop Battery Life Again

[Paulo Cavalcanti]

On Sun, Jul 6, 2008 at 1:23 AM, jdow <jdow at earthlink.net> wrote:

> From: "Paulo Cavalcanti" <promac at gmail.com>
> Sent: Saturday, 2008, July 05 12:40
>
>
>
>  Hi,
>>
>> I noticed that when I boot on kernel 2.6.25,
>> my laptop battery, according to gnome, has 3h:40 min of
>> charge. However, when booting on a 2.6.24 kernel,
>> this number goes up to 4h:20 min.
>>
>> Then, I collected some interesting links, discussing this issue.
>>
>> 1) http://fedoraproject.org/wiki/FWN/Issue100
>>
>> 2) http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption
>>
>> 3) http://kdekorte.blogspot.com/
>>
>> 4) http://samwel.tk/laptop_mode/faq
>>
>> 5) http://lwn.net/Articles/257426/
>>
>> My questions are:
>>
>> 1) should I follow powertop advices blindly?
>>
>> 2) On the first link, in the topic
>> Reducing Power Usage Of Fedora
>>
>> https://www.redhat.com/archives/fedora-devel-list/2007-August/msg00558.html
>>
>> Raul Sundaram recommends using
>>
>> echo 5 > /proc/sys/vm/laptop_mode
>>
>> Why this is not done automatically?
>>
>> 3) In the third link, there is an acpi script that really works,
>> and can be used to change the parameters, when switching from
>> battery to power chord (although some options are wrong,
>> specially the hdparm use - be careful).
>>
>> 4) What about laptop-mode-tools available from Dries' repo?
>>
>> 5) Why different kernels have different expectations, regarding battery
>> discharge?
>>
>> I would like to hear some advice, because I have not owned
>> a laptop for some time, and I do not want to burst my HD
>> or shorten my battery life.
>>
>
> Google for it on the LKML. There was a discussion there in the last week.
>  <https://www.redhat.com/mailman/listinfo/fedora-list>


Thanks, I found it.

http://lkml.org/lkml/2008/7/5/99

Well, what I am doing for now is using /etc/rc.local,
/etc/acpi/actions/battery.sh, and /etc/acpi/events/battery.conf.

I commented some options because I do not have bluetooth,
my laptop does not support wake on LAN,  I want my laptop_mode always ON,
and I am avoiding aggressive power savings for my disk.

Now, I just need some time to evaluate the results.....

--------------------------------------------------------------------------

#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local

# roma

echo 5 > /proc/sys/vm/laptop_mode
/sbin/hdparm -B 254 /dev/sda

-------------------------------------------------------------------------------------------

#!/bin/bash
# /etc/acpi/actions/battery.sh
state=`grep on-line /proc/acpi/ac_adapter/AC/state | wc -l`
if [ $state -gt 0 ]; then
   hal-disable-polling --device /dev/scd0 --enable-polling
   # echo 0 > /proc/sys/vm/laptop_mode
   echo 0 > /sys/devices/system/cpu/sched_mc_power_savings
   # /sbin/hdparm -B 254 -S 0 /dev/sda
   echo 499 > /proc/sys/vm/dirty_writeback_centisecs
   # for i in /sys/bus/usb/devices/*/power/autosuspend; do echo 0 > $i; done
   # /sbin/ethtool -s eth0 wol g
   echo 0 > /sys/module/snd_hda_intel/parameters/power_save
   echo max_performance >
/sys/class/scsi_host/host0/link_power_management_policy
   # echo enable > /proc/acpi/ibm/bluetooth
   policy
else
   hal-disable-polling --device /dev/scd0
   # echo 5 > /proc/sys/vm/laptop_mode
   echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
   # /sbin/hdparm -B 254 -S 252 /dev/sda
   echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
   # for i in /sys/bus/usb/devices/*/power/autosuspend; do echo 1 > $i; done
   # /sbin/ethtool -s eth0 wol d
   echo 1 > /sys/module/snd_hda_intel/parameters/power_save
   echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
   # killall beagled
   # echo disable > /proc/acpi/ibm/bluetooth
fi

------------------------------------------------------------------------------------------------
# ACPID config when switching to and from
# battery mode.
# /etc/acpi/events/battery.conf

event=battery.*
action=/etc/acpi/actions/battery.sh


-- 
Paulo Roma Cavalcanti
LCG - UFRJ
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