On Tue, 2007-04-24 at 08:10 +0200, Sven Anders 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.
well at least the predicted time matched very well the time when the mbp went out of batteries and as that time is based on powerconsumption estimates in /proc/*/BAT0/state I would tend to say it is OK. > 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... well I am using a mbp c1d and it eats about 27W with everything on + full brightness. as you know powerplay is supported on this book, aticonfig --set-powerstate=1 (low power mode) gives me 1-2W less boiling down to 25-26W or max. 10 extra minutes (*), if you further set display-brightness to the lowest level it goes down to 21-22W and backlight off still has 20W. In OSX I get 23.8W (=2h 18min) with everything on and 18.5W (=2h 58min) with everything off+low brightness so we are looking for reasons (I don't expect it to be a single one) that explain a gap of ~4W ... which seems a lot considering that this is essentially what the display at full brightness eats up but still may not be as big as we expected. Soeren (*): this assumes that your battery can be charged to 55Wh mine after half a year of intensive usage is already down to 35Wh ------------------------------------------------------------------------- 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. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Mactel-linux-devel mailing list Mactel-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mactel-linux-devel
