<div class="gmail_quote">On Sun, Jul 6, 2008 at 1:23 AM, jdow <<a href="mailto:jdow@earthlink.net">jdow@earthlink.net</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> From: "Paulo Cavalcanti" <<a href="mailto:promac@gmail.com" target="_blank">promac@gmail.com</a>> Sent: Saturday, 2008, July 05 12:40<div><div></div><div class="Wj3C7c"> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> 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) <a href="http://fedoraproject.org/wiki/FWN/Issue100" target="_blank">http://fedoraproject.org/wiki/FWN/Issue100</a> 2) <a href="http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption" target="_blank">http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption</a> 3) <a href="http://kdekorte.blogspot.com/" target="_blank">http://kdekorte.blogspot.com/</a> 4) <a href="http://samwel.tk/laptop_mode/faq" target="_blank">http://samwel.tk/laptop_mode/faq</a> 5) <a href="http://lwn.net/Articles/257426/" target="_blank">http://lwn.net/Articles/257426/</a> My questions are: 1) should I follow powertop advices blindly? 2) On the first link, in the topic Reducing Power Usage Of Fedora <a href="https://www.redhat.com/archives/fedora-devel-list/2007-August/msg00558.html" target="_blank">https://www.redhat.com/archives/fedora-devel-list/2007-August/msg00558.html</a> 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. </blockquote> </div></div> Google for it on the LKML. There was a discussion there in the last week. <a href="https://www.redhat.com/mailman/listinfo/fedora-list" target="_blank"></a></blockquote><div> Thanks, I found it. <a href="http://lkml.org/lkml/2008/7/5/99">http://lkml.org/lkml/2008/7/5/99</a> 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 </div></div> -- Paulo Roma Cavalcanti LCG - UFRJ