Re: Saving battery power

[Thorsten Schmidt <meine_mailings@web.de>]

Hello,

Am Freitag, 9. März 2007 23:12 schrieb Mattia Dongili:
> On Fri, Mar 09, 2007 at 09:52:20PM +0100, Thorsten Schmidt wrote:
> > Am Freitag, 9. März 2007 21:41 schrieb Mike Hommey:
> > > On Fri, Mar 09, 2007 at 09:25:46PM +0100, Thorsten Schmidt
> > <meine_mailings@web.de> wrote:
> > > > Am Freitag, 9. März 2007 20:42 schrieb Mike Hommey:
> > > > > On Fri, Mar 09, 2007 at 08:32:21PM +0100, Thorsten Schmidt
> > > > <meine_mailings@web.de> wrote:
> > > > > > for some time I've been trying to reduce my laptop's power
> > > > > > consumption (while running on battery power) on my
> > > > > > Fujitsu-Siemens Lifebook C1320 with Debian etch.
> > > > > > - I echo powersave to
> > > > > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor - I
> > > > > > installed laptop-mode in order to shut down my harddrive if it is
> > > > > > unused. - I don't use swap,  /tmp/ is a ramdisk-mount and
> > > > > > /var/tmp links to /tmp, (I've 1 GB RAM)
> > > > > > Thus my hd is barely used and my CPU reaches C3.
> > > > > >
> > > > > > But for some reason, Windows is more efficient in power saving.
> > > > > > (3,5h vs. 4,5h battery life while surfing wireless).
> > > > > > Is there anything else I can do to save battery power?
> > > > >
> > > > > Basically, no, except waiting for Linux ACPI support to get better.
> > Is this about to happen soon?
> > Would switching from vanilla (2.6.20.1) to -mm be an option?
>
> probably using CONFIG_NO_HZ=y (yes, available in -mm), but you'll hardly
> get one more hour.
> Give it a shot.

Thanks, I'll do so. - the kernel is compiling now.
Btw. back in good old 2.4 times, I recently patched ACPI to make it useable.
Is patching ACPI still a good idea?

Thanks,
Thorsten