Re: Degugging DRI

Thank you Jerome,
the suggestions helped me a little bit forward in at least elimination of
one possible source of error.

I now know that the system loads the intended driver, however the error
remains. glxgears works as before and gives frame rates around 600 fps, but
OGRE based applications still don't work. I also checked which libraries are
loaded using strace ( suggested from
http://gatos.sourceforge.net/dri-debug.php ) I could also conclude that the
correct library is indeed loaded.

This now leads me to believe that the error is either in the driver or in
the OGRE engine.

The system uses all default binary packages from Ubuntu repositories. To
build and install newest DRI drivers I assume it would also require a newer
kernel (the current in system is 2.6.15-27).

Is there any other things I can try before rebuilding X and kernel?

Regards
/Michael

2006/12/30, Jerome Glisse <[email protected]>:
>
> On 12/30/06, Aprak Ofatys <[email protected]> wrote:
> > I have problems with a (Ubuntu) laptop with a i915 based gfx with
> certain
> > OpenGL applications.
> >
> > glxinfo rapports that DRI is enabled and programs like glxgears and
> ppracer
> > works with good frame rates. However, when trying to run applications
> based
> > on the OGRE framework, all I get is a black scene. Disabling DRI makes
> the
> > same programs render the scenes.
> >
> >  I've carefully read a lot of problem info's and FAQ's the past days,
> and I
> > still can't figure this out. I suspect it could somehow be related to
> DRI
> > (either a bug or bad configuration).
> >
> > I haven't played around with OpenGL for some years, so DRI is completely
> new
> > to me. I struggle to understand how everything fit's together so that I
> at
> > least can isolate where _not_ to look.
> >
> > From this link (http://dri
> > .freedesktop.org/wiki/DriTroubleshooting) I however I
> > noticed some things that seem suspicious.
> >
> >
> > Under "User Space setup" it says that dri drivers should be located in
> > /usr/X11R6/lib/modules/dri/ , on my system these are located in
> > /usr/lib/dri/ , Which would be the correct location?
> > Also It says that glxinfo should output "libGL: OpenDriver: trying
> > /usr/X11R6/lib/modules/dri/<name>_dri.so". This is not the
> > case on my system. I've followed the hints and reinstalled libGL just to
> > make sure no old or obsolete version is contaminating the system (Ubuntu
> > actually seems to have an issue with this file if nvidia drivers has
> > previously been installed on the system). The file belonged to the
> package
> > libgl1-mesa, but reinstalling it did not make any difference.
> > Neither 'export LIBGL_DEBUG=verbose' nor setting any other environment
> > variables seems to make any difference. Unless I'm missing something
> > obvious, setting this variable in a shell from where a OpenGL program is
> > run, should mean outputting some debug info on the stdout/stderr?
> > The system-wide configuration file /etc/drirc (mentioned in
> > http://dri.freedesktop.org/wiki/ConfigurationInfrastructure)
> > does not exist.
> >
> > I can't figure out which part of the system is responsible for loading
> > /usr/lib/dri/i915_dri.so. Running 'ldd /usr/lib/libGL.so' doesn't seem
> to
> > imply any dependency on any DRI libraries.
> >
> > Any hint's about how to debug the various layers involved would be most
> > welcome.  Is it possible to profile libGL .so in any way so that calls
> to
> > each function results in output in some file in case there actually
> exists a
> > bug and I need to isolate exactly where?
> >
> > Any advice is welcome.
> >
> >  Regards
> > /Michael
>
> Try by setting LD_PRELOAD=/usr/lib/libGL.so then launch ogre some engine
> use dlopen with LAZY flags (or the other don't remember) and thus fail to
> properly figure out DRI, i think you are experiencing somethings along
> thus
> line with ogre.
>
> Don't worry for the path /usr/X11R6 is old path of non modular xorg, since
> then (since xorg modular which i think is in use in your ubuntu distro)
> lib and
> module are under /usr/lib.
>
> best,
> Jerome Glisse
>

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