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

[Richard Kralovic]

Hello,

> With "echo > /sys/bus/spi/devices/spi2.0/state sleep", the current drops 
> from 82.125 mA to 81.562 mA within 10 minutes. The battery is fully charged before test.
> 
> My kernel:
> # uname -a
> Linux om-gta02 2.6.28-rc4 #1 PREEMPT Sun Feb 8 19:53:16 CET 2009 armv4tl unknown

It may be the case that the fixes for the current leak were introduced
in devel branch (linux-openmoko-devel). On kernel 2.6.29-rc3, my tests
show a drop from cca 80mA to cca 47mA.

	Richard

> 
> Before read your reply, I get nothing by removing SD card, ifdown usb0, power off backlight.
> 
> Here is the new script I used:
> 
> #!/bin/bash
> 
> # for exit SSH shell, unplug USB
> sleep 5 
> 
> # strange, 1 to power of backlight
> echo > /sys/class/backlight/gta02-bl/bl_power 1
> 
> echo > /sys/bus/spi/devices/spi2.0/state sleep
> 
> for ((i=0; i<20; i++)); do
>   echo "i = $i:"
>   cat /sys/class/power_supply/battery/{current_now,capacity,voltage_now}
>   sleep 30 
> done
> 
> echo > /sys/class/backlight/gta02-bl/bl_power 0
> echo > /sys/bus/spi/devices/spi2.0/state normal
> 
> But comparing to your ~50 mA, 82 mA is still too large :)
> 
> Could anybody who has latest SHR installation on GTA02, give a test to verify?
> 
> Before start this script, please make sure:
> 1. `/sys/bus/platform/devices/neo1973-pm-gps.0/pwron` output 0, else you can echo 0 into it.
> 2. disable GSM/WIFI/Bluetooth in SHR settings
> 3. SSH to FR through USB if you haven't connect to it.
> 4. stop /etc/init.d/xserver-nodm, /etc/init.d/frameworkd
> 5. killall batget; killall wakerd;
> 6. start the above script, e.g. `power.sh > output_power.txt &` , exit SSH shell, unplug USB
> 
> 10 minutes later, you can plug USB and SSH into FR again. If you can't wait for 10 minutes, 
> modify "sleep 30" to "sleep 5" or something else.
> 
> I'd like to say "thank you" to Rask Ingemann Lambertsen again :)
> 
> 
> On Fri, Mar 27, 2009 at 05:21:59AM +0800, Qingyou Meng wrote:
> 
>> To set brightness: write (brightness_percent / 100 * 255) to file
>> "/sys/class/backlight/gta02-bl/brightness"
> 
>    I think that's why you get so high currents. This
> 
> # echo >/sys/class/backlight/gta02-bl/brightness 0
> 
> doesn't do what you hope it does. You should try
> 
> # echo >/sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.9/glamo3362.0/glamo-spi-gpio.0/spi2.0/state sleep
> 
> also. A shorthand for that file is /sys/bus/spi/devices/spi2.0/state. When
> the display isn't blanked, it reads 'normal'.
> 
>    But, IMHO, consider using a higher-level interface (such as
> freesmartphone.org) to turn off the display instead of trying to find all
> the places to mess with under /sys yourself.
>