http://www.flickr.com/photos/dade/472608054/
see description :)
On 4/25/07, Till Straumann <[EMAIL PROTECTED]> wrote:
/I can confirm your report (mbp, c1d here) - I also
found similar results (~17-18W) under osx. On linux
I get down to 20-21W (low brighness, disk at rest, CPU freq
at 1GHz, ati powerstate=1) but I found that unloading
the 'uvcvideo' driver (isight) seems to save almost
another ~1W or so - I'm at 19-20W right now.
-- Till
PS I still have the wireless up; shutting it down probably
saves also some power.
/
Soeren Sonnenburg wrote:
> 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
>
>
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