On Tue, Nov 04, 2003 at 03:46:33AM +0200, Micha Feigin wrote:
> On Tue, 2003-11-04 at 03:05, Martin Wegmann wrote:
> > Hello,
> >
> > [snip]
> > > I think something has to be wrong... 1 1/2h battery life using a Centrino
> > > based laptop? 8-?
> > >
> > > Mine's an Acer TM290, and the battery lasts about 4h under linux (never
> > > tryed that under windows). Of course it depends on your use of it but...
> > >
> > > Are you using cpufreq? Is your laptop running at a lower speed when on
> > > battery (cat /proc/cpuinfo)? 8-?
> >
> > I am using a T 40 (Pent. M as well), it lasts about 3 h with kde3.1 but I
> > would be keen to extend the battery life when running on battery only or on
> > low battery.
> >
> > my cpu MHz value is the same when runnign on battery or not - how do I
> > activate cpufreq that? It is a program or a function?
>
> It is a kernel option. On kernel 2.4 you need a kernel patch. Under 2.6
> its built in.
> Another thing that may interest you is laptopmode (built in on kernel
> 2.4.23-pre7+, maybe 2.4.23-pre6). It delays disk writes so that your
> disk has a chance to spin down. You risk loosing some data in the event
> of a crash, but you can extend the battery life by 5%-10% probably
> (maybe more). It does have a problem with journaled file systems though
> as they bypass the kernel's dirty buffer for the journal writes. I made
> a patch to fix reiserfs if you want.
> You should use a script from acpid or something like that to activate it
> and cpufreq. I can send it to you if you want (you will still need the
> features enabled in the kernel).
> I am getting almost 4h on a sony vaio pcg-fxa53 (amd athelon 1.3GH) with
> these (If I am not stressing the computer in which case it can drop
> bellow 2h).
>
> >
> > cat /proc/cpuinfo
> > processor : 0
> > vendor_id : GenuineIntel
> > cpu family : 6
> > model : 9
> > model name : Intel(R) Pentium(R) M processor 1300MHz
> > stepping : 5
> > cpu MHz : 1298.912
> > cache size : 0 KB
^^^^
Kernel bug ?
Or the bios 'forgot' to enable caches?
--
Ducrot Bruno
-- Which is worse: ignorance or apathy?
-- Don't know. Don't care.
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