olpc October 2010

olpc@lists.fedoraproject.org

7 participants
4 discussions

Initial F14 developers-only release for XO and XO-1.5
by Daniel Drake 13 Nov '10

13 Nov '10

Hi, After seeing the community help significantly with F11-on-XO development, I'm wondering if we can do something similar for a future release. So, I've taken the first few steps in getting OLPC's technologies rebased on Fedora 14 and Linux v2.6.35. The result has lots of problems, but I figure that publishing the work so far is the first step in getting things fixed. Things are in such an early stage that I'm labelling this as a developers-only release. To name a few: Sugar crashes all the time, the XO-1.5 camera doesn't work, there are some funky graphics bugs on XO-1, no power management, DCON doesn't work right on either laptop, desktop switching lands you at a blank screen. For now, please don't file bugs unless you include patches. And, to take 1 bite at a time out of this huge task, lets ignore all but the biggest sugar issues for now because there is plenty of OS work to be done first. (or alternatively lets take sugar issues directly to SL trac) And the links: 2.6.35 kernel is in git://dev.laptop.org/olpc-2.6 branch olpc-2.6.35 OS build is done from 'f14' branch of olpc-os-builder First released images are at http://build.laptop.org/F14/os1/ Trac is at http://dev.laptop.org/milestone/F14 (basically my immediate TODO), please don't file tickets unless you include patches in these early days Note: I haven't tested those exact images (since Chris @ OLPC built them), so boot-testing them can be the first task for someone. I have been working from the same codebases making local images successfully, so they will probably work (to the extent that things are working). At this point this is all something put together by me in my spare time. It's not known if or when OLPC would start working on an official release from these efforts. But I figure that if we get things properly stabilized and all the work is done cleanly, we'll find one way or another to get this in the hands of deployments. Daniel

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Re: OLPC wireless startup at boot time
by Mikus Grinbergs 20 Oct '10

20 Oct '10

> The question is why does it take so long for the connection to be established? > > A 10-12 second reconnect time is to be expected: > 1. A 1 second delay for the device to be probed and initialized on resume > 2. NetworkManager has a 7 second delay hardcoded > 3. A 1-2 second delay for scanning to complete > 4. A 1-2 second delay for authentication, association, key exchange > (if applicable) and DHCP. It has looked to me as though icons already in Neighborhood View can disappear as the XO reinitializes a complete scan of its radio spectrum. I still think that in the plurality of wireless startup cases the pupil will expect to make a connection on the SAME frequency that the XO was using the last time his XO system's wireless was in use. [I hope that an XO which is in "I've had my wireless connected for a whole hour" mode can nevertheless detect whenever a __new__ AP shows up (whose radio signal was not previously noticed). If that is possible, then the SAME capability should be applicable even at startup time.] I'm thinking that at startup, Network Manager ought to be *inhibited* while the XO listens on the same frequency as was last used. If the XO hears a strong enough signal, it ought to go into its "I've had my wireless connected for a whole hour" mode -- and depend upon "radio signal discovery" the same way that it does when not starting up.. Only if the XO at startup does NOT hear a strong signal on the last-used frequency should the XO depend upon scanning and Network Manager to determine "what are the radio signals that I am receiving now". Whenever steps 2-3 above can be avoided, wireless startup will be noticeably quicker. [For those cases where the pupil has moved to a different schoolroom while his XO was powered down - once the XO is powered up let the pupil perform whatever manual "tuning" procedure he would have used if he had moved to that different schoolroom while carrying his XO powered up.] mikus

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Re: [Dextrose] Sugar restart when downloading
by Bernie Innocenti 18 Oct '10

18 Oct '10

On Mon, 2010-10-18 at 15:58 -0300, Jorge Saldivar wrote: > Hi all, > > Someone knows why dextrose (for xo 1.5) restart while you are > downloading something (big) in journal? > > The test case is the following: > 1. Enter here > http://xoplanet.blogspot.com/2010/08/descargar-open-office-para-xo.html to download oo4kids (~105MB) > 2. Wait and when the download is between 5% or 6% sugar restart and in > the log I can see this message: "python: Modules/gcmodule.c:262: > update_refs: La declaración `gc->gc.gc_refs != 0' no se cumple." This is sl#2064, which has been haunting us for a while. See comment 7, it describes exactly the problem you're seeing: http://bugs.sugarlabs.org/ticket/2064#comment:7 A few days ago I have obtained full a backtrace of this bug on Fedora 14 (so it's not Dextrose specific or 0.88 specific): http://bugs.sugarlabs.org/attachment/ticket/2064/sl2064-full-backtrace.txt I have also filed it in Red Hat's bugzilla, but so far nobody analyzed it: http://bugzilla.redhat.com/show_bug.cgi?id=640972 I have kept the full coredump of the crashing project, if someone would like to inspect the variables with gdb. Another interesting question is: what exactly is the Sugar shell process doing while a file is downloading? We already suspect dbus, but finding the exact function call that triggers the bug may let us create a minimal testcase that triggers the bug quickly and is easier to debug. -- // Bernie Innocenti - http://codewiz.org/ \X/ Sugar Labs - http://sugarlabs.org/

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Script to install missing langs?
by Martin Langhoff 17 Oct '10

17 Oct '10

Hi folks, we're now including a very limited set of langs in our OS images. This can make life rather awkward for small deployments (read: no tech team) using languages not included in our build... Is there a script to install missing locales for already-installed rpms? Cross-posting to fedora-olpc -- maybe there's a Fedora tool to install pruned locales? cheers, m -- martin.langhoff(a)gmail.com martin(a)laptop.org -- School Server Architect - ask interesting questions - don't get distracted with shiny stuff - working code first - http://wiki.laptop.org/go/User:Martinlanghoff

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olpc October 2010