extending battery-life on a macbook or in general

[Toby Smithe]

Isn't this a devel list? I dunno...

Turn on laptop mode. /etc/default/acpi-support I think is the file...

On Mon, 2006-11-06 at 11:46 +0100, Hagen Kaiser wrote:
> Hello everyone,
> 
> My Systems is a Macbook and Ubuntu Edgy.
> I experience in MacOS with a fully charged battery a lifetime of about 4
> to 5 hours, but with Ubuntu there is a maximum of three hours.
> Does somone have a clue what MacOS does that it is able to safe so much
> power?
> What can be done in general to extend battery-life?
> Ubuntu uses powernowd as far as I know. 
> setting the mode to passive didnt give anything.
> 
> I heard about the possibilitiy to set "a gouvernor" (?) in the kernel
> with somthing like 
> echoing  to /dev/cpu0/...
> but also with sudo there is no way to get permission to echo into there.
> (Maybe do I have to boot from LiveCD to that?)
> 
> I already turned down screen light to 50%
> 
> But isnt there something that could be done beside of speedstepping and
> screendarkening? maybe switching off the harddrive (howto do that?) 
> 
> Again: Does someone at least have a theory about how MacOS does achive
> its battery lifetime? Could we implement something similiar?
> 
> And secoundly there is the stand-by mode in MacOS.
> I can close my macbook for several days and make it return immediately
> experiencing nearly no power loss.
> I couldnt make my macbook return from standby till now so i couldnt test
> it. Just wanted to ask if standby in linux is able to do the same.
> 
> greetings
> 	Hagen
> 
> 
>