[ltp] R40 Battery life

[John M Flinchbaugh]

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On Fri, Feb 25, 2005 at 10:16:50PM +1000, shorty wrote:
> I have only just gotten around to getting acpi working on my R40.=20
> Its a
> 1.5 Mhz processor and was just wondering what battery life other=20
> people
> are getting out of there R40's. (mines a 2722 GDM) I can only get=20
> about
> 2.5 hours out of mine. Am running debian with a 2.6.10 kernel,=20
> ibm-acpi,
> and ondemand cpu governer. TP suspends fine and wakes up good to=20
> without
> much fiddling on my behalf, but battery drain is a problem.Lasts=20
> about
> 10 hrs in suspend. Is there a better cpu governer out there in your
> opinion. Ondemand knocks mine back to about 600Mhz most of the=20
> time. Was
> easy to set up too. Also wondering if there are drivers for the ibm=20
> a/b
> wirless card.

I have a 1.4GHz R40 and probably average 4 hrs on battery, though I've
seen 5.  I use cpufreqd, which sounds like it does the same thing as
your ondemand governor -- it switches between 1.4GHz and 600MHz as
needed.  I'm using ACPI as well.  S3 suspend doesn't last long due to
some Radeon driver bug or something, so I use swsusp.

The only other thing I'd have to recommend is to compile laptop-mode
into your kernel and install Debian's laptop-mode package.  This will
make it easier for the notebook to spin down the harddrive while not in
use.

I also try to keep my LCD brightness turned down, though I'm not sure
how much that really affects power drain.

For the wireless card, check out the drivers at http://ipw2100.sf.net/.
They work great, and are pretty easy to install.
--=20
John M Flinchbaugh
john@hjsoft.com

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