[Community] GTA04 - Power management improvements

Dr. H. Nikolaus Schaller hns at goldelico.com
Wed Jan 29 10:45:11 CET 2014

Am 29.01.2014 um 10:38 schrieb Neil Jerram:

> Hi!
> On 2014-01-29 08:34, Dr. H. Nikolaus Schaller wrote:
>> HI,
>> Am 29.01.2014 um 09:07 schrieb Hermann Schwärzler:
>>> Hello
>>> On 01/28/2014 11:27 AM, Dr. H. Nikolaus Schaller wrote:
>>>> Am 28.01.2014 um 10:28 schrieb Hermann Schwärzler:
>>> [...]
>>>>> No I did not use such a script. Just the "poweroff" command of the
>>>>> system. Tonight I will power off after running this script and will
>>>>> report my findings.
>>>> Ok.
>>> I can confirm that powering down the modem before powering down the
>>> device results in ~0 power usage!
>>> I used the modem-poweroff.sh script in /opt/qtmoko/bin/ yesterday
>>> evening before calling "poweroff" on the device and after powering it on
>>> this morning (after 9:25 hours) I saw a mere 5mAh decrease in the
>>> charge-value of the battery. I saw this *after* boot so most/all of it
>>> is due to power-usage of the boot process.
>> That is fine since everything else would have made me wonder a little.
> I assume that this testing and discussion is primarily for the GTA04 A4.


>  Is the modem-poweroff.sh script also useful for the A3?

Unfortunately no. The A3 board had an unfixable design flaw (it was our first variant that worked almost)
that prevented us to turn off the modem. Unless somebody finds a hidden AT command with the same
effect (I just know AT_ORESET but that keeps it powered on) and a method to wake it up again.

The A5 board will also fix the RS232/IrDA issue.


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