Laptop Battery Life Again

[jdow]

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.

{^_^}