Re: [gentoo-user] MacBook: How many hours on battery with Gentoo?

["b.n." <brullonulla@gmail.com>]

Florian Philipp ha scritto:
> On Tue, 2008-02-19 at 20:07 +0100, b.n. wrote:
> 1. Use laptop-mode if you don't do it by now. Really nice even without
> its delayed disk write feature.

Er, I already use it. I wrote it, in fact. :)

> 2. Displays are by far the biggest energy consumers. Lower its
> brightness as far as possible. Some laptops even allow you to switch its
> backlight off - very nice if you are outdoor.

That's what I do (Never tried outdoor however). Somehow the pommed
daemon seems less granular in managing the screen than OS X, however.

> 3. Use the powersave-governor. If you really need the additional power
> ondemand offers, try the conservative-governor. It increases the clock
> rate slower than ondemand and might stop it from jumping too fast too
> high.

Thanks for the tip!

> 4. Try sys-power/powertop. It shows you processes creating a lot up
> wakeups for the CPU. It also gives you tips on your kernel config.

Thanks too. I know about powertop but it complains about something not
correctly set up in my kernel. I have to do this janitorial work.

> 5. Sometimes a BIOS update helps...

Well, if it's a BIOS issue, OS X works around it? I think it's just my
system suffering some unavoidable limits with new machines, while Apple
of course designed OS X around its own machines.

> Hope this helps. 

Thanks a lot!

m.
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