[Gta04-owner] Crowdfunding an Ubuntu smartphone

NeilBrown neilb at suse.de
Tue Aug 27 02:13:11 CEST 2013


On Tue, 27 Aug 2013 08:06:16 +1000 Liz <edodd at billiau.net> wrote:

> On Tue, 27 Aug 2013 07:56:26 +1000
> NeilBrown <neilb at suse.de> wrote:
> 
> > On Mon, 26 Aug 2013 13:58:21 +0200 Sven Dyroff <S.Dyroff at phytec.de>
> > wrote:
> > 
> > > Hello Radek,
> > > 
> > > > Together with reenumerating modem it makes GTA04 barely usable
> > > > even for a few hardcore supporters but unusable for normal users.
> > > 
> > > Not being reachable reliably is indeed the main barrier that
> > > prevents GTA04 to be usable as daily phone. It results in the
> > > requirement, that you need two phones to carry with you: One for
> > > making phone calls and SMS and the GTA04 for the rest. Otherwise
> > > you'll get the problems that Christ van Willegen described
> > > exemplary:
> > > 
> > > "I get a _lot_ of flack about not being reachable from my wife, who 
> > > repeatedly calls on me to drop the GTA project and get another
> > > phone so I am reliably reachable again :-("
> > > 
> > > The second big problem indeed is power management. But power usage
> > > during suspend is a minor problem. Much more serious is the fact,
> > > that you cannot charge GTA04 in the same way as you're used from
> > > every other mobile device: Connect a charger to it in the evening
> > > and have a fully charged device in the morning.
> > > 
> > > Is it kernel or is it userspace which can be blamed for the
> > > problem, that after having charged up to 100% GTA04 will discharge
> > > again instead of switching over its power demand to external supply
> > > and thus keep its battery at 100% filling level, like every other
> > > mobile device does?
> > 
> > Does every other device really do this?
> > 
> > If you had a device which would last for 5 days in standby, then
> > during the 6-8 hours between when the battery finished charging and
> > when you unplug it in the morning, it would use 8/120 of 1/15th of
> > the battery. If your display shows you battery level with 5 (or even
> > 10) bars, this would still show as full.
> > 
> > The reason it is a problem for GTA04 is not that it stops charging
> > and then runs on battery, but that while on battery it uses too much
> > current.
> > 
> > It is possible to reprogram the hardware to start charging the
> > battery again a bit earlier.  I think it currently restarts at about
> > 75%.
> > 
> > It isn't possible to run purely of the mains current as that
> > typically only provides 500mA, and I think the modem can occasionally
> > need bursts in excess of this.
> > 
> > NeilBrown
> 
> Mine is unusable because I can't plug it in partly discharged and it
> recharge from the USB power supply (mains, car, other battery brick).
> It only recharges when it is fully discharged.
> Once it's fully discharged it's off, and I may not notice or I may not
> have any other source of power to recharge it at the time.

That is very peculiar.  It sounds like a kernel bug.  Which kernel are you
running (Exact git commit if possible)?  What config file?

NeilBrown
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