linux-kernel - Re: Battery life difference

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Message-ID: <20080705085432.2f9b2964@infradead.org>
Date:	Sat, 5 Jul 2008 08:54:32 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Felipe Balbi" <felipebalbi@...rs.sourceforge.net>
Cc:	"Kernel development list" <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: Battery life difference

On Sat, 5 Jul 2008 18:44:21 +0300
"Felipe Balbi" <felipebalbi@...rs.sourceforge.net> wrote:
> hmm... interesting :-)
> where should i look for more info ? Any pointers would be nice
> 
> > There's a few things you can do to help stuff along; make sure
> > you're using AHCI.
> 
> not loaded. Thanks

you may also need to toggle your bios to enable AHCI btw

> 
> > Also take a look at
> > http://kerneltrap.org/mailarchive/linux-kernel/2008/5/8/1771024
> > because these patches save like 0.75W in our lab.
> 
> cool, is it merged upstream ?
> I'll build current git kernel and reply again with new linux results.
> It could be that ubuntu 2.6.24 is broken somehow...
> 
> > To be honest, I'm surprised at your results; in our testing (with a
> > different distro though) we don't see such a difference and Linux is
> > doing rather well.
> 
> can you get powertop results in a 2.6.24 distro kernel and current git
> kernel ?

most of my measurement machines are in the office ;(

Anyway, also make sure you use the 0.11 version of powertop; we added
some newer stuff into that version...

> 


-- 
If you want to reach me at my work email, use arjan@...ux.intel.com
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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