<div dir="ltr">Also, if you did your evaluation based on 13.1.0, should know 13.2.0<div>have fixed some performance problems related to the port to Gtk3</div><div><br></div><div>Gonzalo</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Wed, Jul 3, 2013 at 10:51 AM, Walter Bender <span dir="ltr"><<a href="mailto:walter.bender@gmail.com" target="_blank">walter.bender@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5">On Tue, Jun 25, 2013 at 2:28 AM, James Cameron <<a href="mailto:quozl@laptop.org">quozl@laptop.org</a>> wrote:<br>
> On Tue, Jun 25, 2013 at 12:18:43AM -0500, Sebastian Silva wrote:<br>
>> El 21/06/13 13:56, John Watlington escribió:<br>
>> >This is likely due to the video controller being disabled before<br>
>> >the DCON driver has completely finished loading the image into the<br>
>> >DCON.<br>
>> >>Our image is based on 11.3.1 shipping firmware olpc-firmware-q3c06 (but my testing machine has q3c07 and exhibits the same malfunction).<br>
>> >><br>
>> >>(...)<br>
>> ><br>
>> >We did some work to fix the DCON driver in newer releases.<br>
>> ><br>
>> So what component / package etc should I be looking to backport?<br>
><br>
> The kernel, specifically kernel patches to the DCON driver or related<br>
> components.<br>
><br>
> 11.3.1 was based on kernel 2.6.35.13_xo1.5-20120508.1139.olpc.eb0c7a8<br>
> which corresponds to branch olpc-2.6.35 of the olpc-kernel repository:<br>
><br>
> <a href="http://dev.laptop.org/git/olpc-kernel/commit/?h=olpc-2.6.35&id=eb0c7a8" target="_blank">http://dev.laptop.org/git/olpc-kernel/commit/?h=olpc-2.6.35&id=eb0c7a8</a><br>
><br>
> Development then switched to the branch x86-3.3, and this is where any<br>
> DCON or display driver fixes after 11.3.1 will be found.<br>
><br>
> I've had a quick look and these viafb fixes look relevant:<br>
><br>
> <a href="http://dev.laptop.org/git/olpc-kernel/commit/?h=x86-3.3&id=3ef9f18dfe5f97dbae96b8b7658590b6dbf81cea" target="_blank">http://dev.laptop.org/git/olpc-kernel/commit/?h=x86-3.3&id=3ef9f18dfe5f97dbae96b8b7658590b6dbf81cea</a><br>
> <a href="http://dev.laptop.org/git/olpc-kernel/commit/?h=x86-3.3&id=d5caefcdf160b0b24153bba89b111419da2f92c3" target="_blank">http://dev.laptop.org/git/olpc-kernel/commit/?h=x86-3.3&id=d5caefcdf160b0b24153bba89b111419da2f92c3</a><br>
><br>
> Other than these viafb fixes, there have been no DCON driver fixes in<br>
> x86-3.3. I recall some fixes in the ARM laptops though. Perhaps they<br>
> were not backported.<br>
><br>
> As kernel fixing can be costly for you, let me take you back a few<br>
> steps in diagnosis ... can you confirm that the problem also affects<br>
> the original OLPC OS 11.3.1 and not only your own build of 11.3.1?<br>
><br>
> Does the problem only occur with automatic power management enabled?<br>
><br>
> Is there a way to induce the problem quickly?<br>
><br>
> It reminds me of #11231 and #10038. You might see if the reproducers<br>
> in those tickets cause a problem.<br>
><br>
> Also, although we understand you cannot go to deployment phase with<br>
> anything later than 11.3.1 because of non-technical reasons, the<br>
> analysis of this problem could really benefit from trying to reproduce<br>
> it with 12.1.0, 13.1.0, or 13.2.0. If the problem does not reproduce<br>
> in 12.1.0 for instance, it means the fix may be in that interval. It<br>
> would also help to exclude hardware as a cause.<br>
><br>
<br>
</div></div>You mentioned some performance issues as the principle reason for not<br>
updating. Could you elaborate on these? It may be a better use of<br>
resources to work on fixes those issues than trying to backport kernel<br>
patches.<br>
<br>
regards.<br>
<br>
-walter<br>
<div class="im"><br>
> --<br>
> James Cameron<br>
> <a href="http://quozl.linux.org.au/" target="_blank">http://quozl.linux.org.au/</a><br>
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<br>
<br>
<br>
</div>--<br>
Walter Bender<br>
Sugar Labs<br>
<a href="http://www.sugarlabs.org" target="_blank">http://www.sugarlabs.org</a><br>
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