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ATM7029 Power management problem

3K views 3 replies 2 participants last post by  cxz 
#1 · (Edited by Moderator)
Hello, I have a tablet with ATM7029 chip, which has battery charging problems.
I should clarify, I've some knowledge in electronics.

Was able to determine that the tablet shuts down before the battery is actually unloaded (it has around 3.4V and go shutdown)

Want to know if there is any way in software to avoid it (maybe a XML or so)

It served even if the device does not go out in detect low battery (The battery has her own ic to avoid dischargin below 2.5V)

Thanks in advance.
 
#3 ·
Thanks for the responce,

I set zero_cap_v=2500 without success :C

Reading sys/......./power_supply/atc260x-battery/bl_on_voltage I get 3300000 so the limit continues to be 3.3 v

Something it is not clear to me is, who is responsible for taking the values of xml? is the driver? or maybe the value is hard coded in it :S.
 
#4 · (Edited by Moderator)
/bl_on_voltage? Could it be related to backlight?
My tab doesn't seem have that file.

A poster at 4pda says that the value worked for him.
Although he used a value bigger than original.
http://4pda.ru/forum/index.php?s=&showtopic=416327&view=findpost&p=23439689

Yes, many values seem to be hard coded and therefore not used.
Checking modules using a hex editor can give some clues
which are used and how...
atc260x_cap_gauge.ko seems to read that zero_cap_v value..
 
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