Motorola Droid 4 progress, power consumption

Hi!

quoted

Anyway, >5.5hours of standby with screen off, GSM on is already
usable.

Just to rub that in, you do mean GSM usable for voice calls and
SMS with your unicsy_demo with mainline kernel plus the pending
LCD related patches, right? :)

quoted

This is the core of code I'm using.

https://github.com/pavelmachek/unicsy_demo

Battery graphs are attached. I'm not sure if the battery was really
close to empty at that point -- voltage curve should have different
shape if that was the case. 

Cool. BTW, the value for POWER_SUPPLY_POWER_AVG should be quite
accurate for the whole device power consumption.

It comes from the shunt resistor measured by the PMIC. Sorry I don't
remember how often it needs to be polled but I'm guessing polling it
once a minute or so should be plenty.

I'd like current_avg more, but if I cat it manually, it changes on
order of seconds, and quite significantly... which suggest shorter
polling interval would be needed.

user at devuan:/sys/class/power_supply/battery$ date; cat current_now
current_avg
Thu May  3 09:33:05 CEST 2018
-71000
-218408
user at devuan:/sys/class/power_supply/battery$ date; cat current_now
current_avg
Thu May  3 09:33:06 CEST 2018
-61000
-200238
user at devuan:/sys/class/power_supply/battery$ date; cat current_now
current_avg
Thu May  3 09:33:06 CEST 2018
-51000
-209879
user at devuan:/sys/class/power_supply/battery$ date; cat current_now
current_avg
Thu May  3 09:33:07 CEST 2018
-56000
-72308
user at devuan:/sys/class/power_supply/battery$ date; cat current_now
current_avg
Thu May  3 09:33:08 CEST 2018
-37000
-211362

Hmm oh and the POWER_SUPPLY_CHARGE_COUNTER value should be monitored
by your libbattery and it's low value and high value should be saved
to a file. Low should be saved when we get the battery low interrupt
and battery state changes to POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL.
High value should be saved on POWER_SUPPLY_CAPACITY_LEVEL_FULL.

Then when you know the high value and low value, you can calculate
the remaining capacity based on the current value and
POWER_SUPPLY_POWER_AVG.

I'll look into that... but probably will do experiments with python,
first.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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