[maemo-developers] Power management is going to drive me mad!

[From: nick loeve]

Hi,

On Thu, Jun 19, 2008 at 9:58 AM, George Nachman <maemodev at georgester.com> wrote:
> Hi maemo-developers,
>
> Is it possible on the N800 to programatically shut down the wifi
> interface and bring it back up?
>
> I have an application that very occasionally needs network
> connectivity. If I leave my device connected to wifi, the battery dies
> too quickly. I would like to have the software turn on the wifi
> interface, do its thing, and then turn the interface off to conserve
> energy. I've considered other solutions, but I think this is the
> simplest answer.

I can leave my device on (with wifi on and connected to my AP) for
days at a time. I have a n800, with a pretty-close-to-stock install.

There have been some threads on this list recently about certain AP's
and/or ad-hoc mode causing excessive traffic and therefore not letting
the device go into the appropriate power saving modes. Also if
applications see (via libconic) that there is a connection maybe they
are doing excessive or not needed work in the background.

>
> I thought at first that libconic could do this, but it appears not (at
> least not in Python: see the comment here:
> https://garage.maemo.org/svn/pymaemo/packages/python-conic/branches/chinook/tests/test_disconnect.py).
> Is it possible? I saw a veiled reference to sending d-bus messages
> (http://maemo.org/pipermail/maemo-developers/2007-April/009462.html),
> but it wasn't specific enough to turn into code.
>
> I tried running /etc/init.d/wlancond stop, but that doesn't seem to
> decrease power consumption.
>
> Is there a magical dbus message I can send? If I could trick it into
> entering/exiting flight mode, that would work too. I've been
> experimenting for hours with no luck.

Try seeing what dbus message are floating around on the system bus
when you go on/offline:

dbus-monitor --system

Cheers

>
> Thanks for your help,
> George
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>



-- 
Nick Loeve