Re: [Mactel-linux-devel] C4 state - Status report

[Davide B. <da...@da...>]

you can see the power drain using System Profiiler.app under section 'power=
'

On 4/24/07, Sheer El-Showk <sh...@gm...> wrote:
> Hi Davide,
>
> Thanks for the info.  I'm hope you don't mind that I'm CCing the list
> but I think others will appreciate this info.
>
> How did you measure the power drain in OS X (i.e. 1200 mA)?
>
> Cheers,
> Sheer
>
>
> On 4/24/07, Davide Bertola <da...@da...> wrote:
> > At fist macbooks do not have ATI card. It's Intel (macbook non-pro).
> >
> > I use a macbook and i get ~3 hours on linux and ~4.5 hours on OSX.
> > It's a macbook core duo (not core 2 duo) and the battery is new.
> >
> > Linux measures capacity in Watts (W), osx in Amperes * 10^(-3) (mA).
> > Under linux I see a maximum capacity of ~52000 mW, and using OSX it's ~=
5200
> > mA.
> > Since mW -> mA is a simple conversion because we only have to /10
> > (should be 11 'cause battery works at 11 volts average but let's say
> > it's 10) we can compare the idle power consumpition.
> >
> > On my system osx idles at ~1200 mA, linux does 16 W -> 1600 mA.
> > It's also hotter when using linux. Why ?
> > I guess:
> > - Lack of C4 state support.
> > - No way to turn off bluetooth (always looking for devices).
> > - maybe GPU Power Management support is not so efficent.
> > - don't know
> >
> > Anyway, I think that after a battery calibration, it's ok to compare
> > Watts and Amperes outputs of Linux and OSX.
> >
> > On 4/24/07, Sheer El-Showk <sh...@gm...> wrote:
> > > Hi Sven,
> > >
> > > I asked about the MacBook issue in a previous post somewhere.  I've
> > > also become convinced that the problem is the GPU (there was an
> > > article I mentioned on Phoronix where someone compared the temperatur=
e
> > > of the GPU of an ATI card in Linux and windows and found it much
> > > higher in the former).  Regarding the MacBook,  here's a webpage
> > > claiming a 3 hour battery life under linux:
> > >
> > > http://desrt.mcmaster.ca/macbook.xhtml
> > > http://bbs.archlinux.org/viewtopic.php?id=3D22960
> > >
> > > The second link has a bit of discussion about battery life under Linu=
x
> > > on the MB.  I don't know what the OS X battery life is but I'm
> > > guessing its at least 4 hours (people there say 3-4 hrs).
> > >
> > > I agree that looking into this is the right approach.  If the GPU is
> > > the problem there's very little we can do about it but wait for ATI s=
o
> > > we might as well find out if this is the case.  Hopefully somebody
> > > from the list can post some specific MB stats.  It would also be good
> > > to see if its possible to get the MB battery life up to its OS X valu=
e
> > > using USB autosuspend and dynticks.
> > >
> > > cheers,
> > > Sheer
> > >
> > > On 4/24/07, Sven Anders <an...@an...> wrote:
> > > > Hello!
> > > >
> > > > I thought about the power consumption. Maybe we can track the probl=
em
> > down
> > > > some other way...
> > > >
> > > > 1. Is the output of '/proc/acpi/battery/BAT0/state' reliable? If it=
 is,
> > > >    we can use it for testing, otherwise we have to test how long th=
e
> > battery
> > > >    really lasts.
> > > >
> > > > 2. As far as I remember, the MacBook is very similar to the MacBook=
 Pro
> > in
> > > >    the hardware it's using. The main difference is the GPU.
> > > >    How long does the battery of the MacBook under Linux last in
> > comparison
> > > > to
> > > >    MacOS X?
> > > >    If it's a small difference, so our problem is the power consumpt=
ion
> > of
> > > >    the ATI GPU (assuming the Intel-GPU draws as less power under Li=
nux
> > as it
> > > >    does under MacOSX). On the MacBook we have the advantage, that i=
t's
> > an
> > > >    open-source driver.
> > > >    If the power drain is as bad as on the MacBook Pro (and we check=
ed
> > the
> > > >    Intel-GPU driver, that is's using all power-saving states
> > available),
> > > >    the problem lies somewhere else...
> > > >
> > > > To check these, we need some output of the MacBook's /proc/acpi val=
ues
> > or
> > > > somebody who helps us to prove these theory...
> > > >
> > > > Any comments to these thoughts? Any errors in it?
> > > >
> > > >
> > > > Best regards
> > > >  Sven
> > > >
> > > > --
> > > >  Sven Anders <an...@an...>                 () Ascii Ribbon
> > Campaign
> > > >                                                  /\ Support plain t=
ext
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