Thanks Kyle for a great summary of the work being discussed on the
kernel ML. I am simply not able to keep up with all the lists and very
much appreciate your helping out here.
Michael
Kyle Bassett wrote:
I have been following the "Suspended Mode" thread in the kernel ML and
they have made amazing progress within the last week. As GTA02A5
currently stands, a "cold" suspend mode (just GSM in standby awaiting
incoming call/sms), could result in >20 days of standby!
For those technical people on this list, they have gotten GTA02A5 in
suspend using ~2.07mA @ 3.7v (fully charged batt). If the GTA02 will
have a 1200mAh battery, that's ~24 days of suspend runtime in a perfect
world. The goal is set around 1mA-2mA of suspend current draw, with
best case scenario suspend time of ~50 days (sure beats 4 hours... :-P
). There are also issues such as internal battery discharge, ~30% over
90 days for one of the packs that is being considered, which will reduce
the final suspend runtime available.
Currently, work continues attempting to shave even more power
consumption from a sleeping Freerunner. Individual power consumption of
the different internal devices is still taking place, that way any user
can approximate their battery lifetime (but each internal device has a
few different states, making this a tedious task). In the very near
future, we should see some numbers coming in about the "talk" runtime,
once some GSM power state issues are resolved.
There is talk about pushing startup power control of the internal
devices (wifi, bt, gps, mmc, etc.) to user level, as every user may or
may not want certain devices available at bootup/all the time
(availability vs. duration).
It's nice to have some good news, everyone keep up the good work!
-Kyle
On Thu, Feb 14, 2008 at 12:29 AM, Michael Shiloh <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Nick Guenther wrote:
> On Feb 8, 2008 4:04 AM, Michael Shiloh <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
>> Hello,
>>
>> I've researched this a little, and this is what I've learned:
>>
>> 1. We are still looking at a number of different batteries, so
there is
>> no "final" capacity or feature set determined yet.
>>
>> 2. The capacity will most likely be around 1200mA.
>>
>> If you find any place on the wiki that says something other than
1200mA,
>> can you please make the correction? You may reference this email.
>
> Oh. That's... really disappointing. The battery life is already
> unusable, and the faster processor and wifi will just make this even
> worse.
We are well aware of software changes we need to make in order to
improve battery and have simply not had the time to do this. You can
expect much better battery life when we implement these changes.
In fact if you look in the archives of the kernel mailing list you will
see that a tremendous amount of progress has happened over the past few
days. I think the current SVN code supports a much improved suspend mode
that my very simple testing suggests should last for well over 12 hours.
And work continues.
Michael
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