Degugging DRI

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
ppracerworks 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
implyany 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

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