Re: Saving battery power
On Sun, Mar 11, 2007 at 10:50:35AM +0100, Thorsten Schmidt wrote:
> 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?
no. Moreover if you switch to -mm you'll get the acpi test branch which
is ahead of plain 2.6 kernels anyway.
To save some more power in linux you may also want to try unloading
usb modules.
--
mattia
:wq!
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