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

Rask Ingemann Lambertsen rask at sygehus.dk
Sat Mar 28 14:08:40 CET 2009

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.

Rask Ingemann Lambertsen
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