[Gta04-owner] GTA04 power management.

NeilBrown neilb at suse.de
Mon Jan 2 10:23:18 CET 2012


On Sun, 1 Jan 2012 18:09:08 +0100 Rainer Dorsch <ml at bokomoko.de> wrote:

> Hi Neil,
> 
> Am Sunday 01 January 2012 schrieb NeilBrown:
> > On Sat, 31 Dec 2011 15:43:24 +0100 Rainer Dorsch <rdorsch at web.de> wrote:
> > > Am Saturday 24 December 2011 schrieb Dr. H. Nikolaus Schaller:
> > > > > thanks for the code and sharing the data of your experiments.
> > > > > 
> > > > > 
> > > > > 
> > > > > can we do a bottom-up calculation? I.e. build up a spreadsheet like
> > > > > document,  which contains the power consumption of every
> > > > > component/subsystem in each of its power mode (if there are more than
> > > > > on and off).
> > > > 
> > > > There is a (incomplete) table in section 5.20 on page 51 of the system
> > > > manual for the GTA04.
> > > 
> > > Not sure if it helps, but I found some detailed power numbers for the
> > > n900:
> > > 
> > > http://wiki.maemo.org/N900_Hardware_Power_Consumption
> > > 
> > > Suspend (echo mem >/sys/power/state), wifi and GSM off. 2 mA T
> > > Suspend, GSM on, connected to 3G (2 bars) 5 mA T
> > > Suspend, GSM on, connected to 2G. (2 bars) 3.6 mA T
> > > Idle, no SIM, wlan off 7 mA at 4.1 V T
> > > 
> > > Rainer
> > 
> > Thanks for the pointer.
> > 
> > It does look like very similar hardware, and much lower power usage than I
> > am getting.  Both in suspend and in idle the N9 uses much less power.
> 
> Do you have a pointer to the N9 power numbers?

Sorry.  Typo.  I meant "N900" - the numbers above - not "N9".

BTW I found some patches for usb power management and I now have suspend
current below 70mA which is an improvement but we still have a way to go.

NeilBrown
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