test result of battery current against display brightness and GPS power mode

Rask Ingemann Lambertsen rask at sygehus.dk
Sun May 10 03:08:39 CEST 2009


On Fri, Mar 27, 2009 at 05:21:59AM +0800, Qingyou Meng wrote:
> Because display and GPS chip may be powered on for a long while, I
> choose to test them here.
[snip]
> Here is the results:
> 
> 1. when GPS chip is powered off, test brightness vs. battery current:
> 
> * brightness = 100%: battery current ~= 203 mA
> * brightness =  75%: battery current ~= 153 mA
> * brightness =  50%: battery current ~= 116 mA
> * brightness =  25%: battery current ~= 101 mA
> * brightness =   0%: battery current ~=  95 mA

   See also
http://lists.openmoko.org/pipermail/openmoko-kernel/2008-October/005542.html

   I.e. you're not turning the display off by just setting the backlight
brightness to 0.

-- 
Rask Ingemann Lambertsen
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