Corrupted display on XO1.5 when suspended with screen on

[Gonzalo Odiard]

Also, if you did your evaluation based on 13.1.0, should know 13.2.0
have fixed some performance problems related to the port to Gtk3

Gonzalo


On Wed, Jul 3, 2013 at 10:51 AM, Walter Bender <walter.bender at gmail.com>wrote:

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