[Gta04-owner] uptime of rtc (unusual usage pattern)
psonek2 at seznam.cz
Wed Feb 13 13:42:08 CET 2013
On Wednesday, February 13, 2013 09:37:25 AM e.waelde wrote:
> Ok, I took your information as a trigger to test this again:
> I did a full load on Sun evening, then I shut down the device
> (long press on power, select "shut down the device").
> I booted it up on Mon morning, the battery indicator was
> still green at approx. 80% or so (hard to judge visually).
> on Mon evening the battery indicator was at approx. 40%.
> just now (Tue morning) I bootet it again, the battery indicator
> was red at approx 10%.
> So lets for the argument assume that the battery in the
> *shut down* device lasts 40 hours. That would mean that
> I had to charge the device every 2 days.
> This is far away from the gta02, which I could leave shut down
> for at least 14 days without being afraid of the battery
> being empty.
> 1. My battery is really worn out. How to jugde?
> I do have a second battery which I can test. But so far
> I have not had any hints that one of them would behave
> significantly different.
> 2. something is not shut down after all
> I do remember a discussion about the gsm modem not being
> shut down properly, however I would need to search the
Yup, currently QtMoko keeps modem powered on. But you can power it off from
command line as described here:
The commands are:
echo 1 >/sys/devices/virtual/gpio/gpio186/value # stops operation (but
echo 0 >/sys/devices/virtual/gpio/gpio186/value # 1->0: off
But for some reason it currently does not save more power - it's best just to
suspend the phone.
If you want to measure the power consumption accurately you should use
/sys/class/power_supply/bq27000-battery/charge_now. It was described by Neil
Brown on the mailing list some time ago. The formula is someting like:
(first_charge_now - last_charge_now) * 36 / (last_timestamp -
This should give you average current the power the phone was consuming in time
For detecting if phone is on charger you should use:
Btw it's not the same as battery charging - battery can discharge even when
charger is plugged.
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