[Sugar-devel] Wanting to know a bit of (NetworkManager) workflow upon resume-from-suspend

[Martin Abente]

I think (guessing by the responses) the original problem here is that, if
you disable the mesh AFTER NM has taken the device, NM crashes. This a
regression bug, considering that this didn't happened in fedora-11 based
builds.

So the solution here is to find another place to place the script, where it
guarantee that the script will be executed before NM does its job at resume
time.

Another solution is to find out why NM crashes now and why didn't before,
but I wouldn't go that way.

Cheers,


On Wed, May 2, 2012 at 3:28 AM, Martin Langhoff
<martin.langhoff at gmail.com>wrote:

> On Wed, May 2, 2012 at 3:22 AM, Ajay Garg <ajaygargnsit at gmail.com> wrote:
> > The /etc/powerd/postresume.d/disable_mesh.sh  doesn't work.
>
> So we need to understand why it does not work. Is it a race condition?
> Perhaps it is better fixed as a udev script -- triggering when the
> device appears.
>
> The step that disable_mesh performs is very important. If you don't
> disable it at that level, you haven't disabled mesh at all and all the
> problems persist.
>
> >>  - disable mesh on boot
> > Done. Added the 'echo 0' script in 'start()' method of NetworkManager, so
> > that the effect takes place before NetworkManager starts up. Works like a
> > charm.
>
> Ok. Maybe a udev script is a better place.
>
> >>  - disable mesh on resume, from a powerd-triggered script
> > Does not work, as explained above.
>
> Right but you MUST find a way to make it work.
>
> >>  - blacklist the MAC address so NM ignores it
> >>
> >> you win. Yes, every XO has a different MAC address, but you can read
> >> that on first boot of the OS, and write the NM configuration. See the
> >> olpc-configure script for examples.
> >
> >
> > Would be awesome. I believe this is the one and only complete solution
> > possible :)
>
> Careful here! This only hides the device from NM so you don't race with NM.
>
> > Could you point me to the suitable (examples) link? I will be heartfully
> > grateful.
>
> look at the latest olpc-configure in git://
> dev.laptop.org/projects/olpc-utils
>
>
>
> m
> --
>  martin.langhoff at gmail.com
>  martin at laptop.org -- Software Architect - OLPC
>  - ask interesting questions
>  - don't get distracted with shiny stuff  - working code first
>  - http://wiki.laptop.org/go/User:Martinlanghoff
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