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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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 temperature > > 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=22960 > > > > The second link has a bit of discussion about battery life under Linux > > 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 so > > 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 value > > using USB autosuspend and dynticks. > > > > cheers, > > Sheer > > > > On 4/24/07, Sven Anders <[EMAIL PROTECTED]> wrote: > > > Hello! > > > > > > I thought about the power consumption. Maybe we can track the problem > 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 the > 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 consumption > of > > > the ATI GPU (assuming the Intel-GPU draws as less power under Linux > as it > > > does under MacOSX). On the MacBook we have the advantage, that it's > an > > > open-source driver. > > > If the power drain is as bad as on the MacBook Pro (and we checked > 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 values > or > > > somebody who helps us to prove these theory... > > > > > > Any comments to these thoughts? Any errors in it? > > > > > > > > > Best regards > > > Sven > > > > > > -- > > > Sven Anders <[EMAIL PROTECTED]> () Ascii Ribbon > Campaign > > > /\ Support plain text > > > e-mail > > > ANDURAS service solutions AG > > > Innstraße 71 - 94036 Passau - Germany > > > Web: www.anduras.de - Tel: +49 (0)851-4 90 50-0 - Fax: +49 (0)851-4 90 > > > 50-55 > > > > > > Rechtsform: Aktiengesellschaft - Sitz: Passau - Amtsgericht Passau HRB > 6032 > > > Mitglieder des Vorstands: Sven Anders, Marcus Junker > > > Vorsitzender des Aufsichtsrats: Dipl. Kfm. Thomas Träger > > > > > > > ------------------------------------------------------------------------- > > This SF.net email is sponsored by DB2 Express > > Download DB2 Express C - the FREE version of DB2 express and take > > control of your XML. No limits. Just data. 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