Thanks for all the help guys. It seems the depth-rate setting was preventing
FlightGear to run. After I have changed the depth from 24-bits to 16-bits,
FlightGear runs fine. Unfortunately, enemy-territory slows down even more
under 16-bits (not that it is playable anyway).
As far as hardware acceleration goes, even though it is available, I really
don't think those 3D applications are using it. glxgears is running at ~500
fps. I once managed to get the same amount of fps with no direct rendering,
Also, the framerates of glxgears seem to be extremely dependent on CPU cycles.
I have seen it falls to 9 while the system is accessing something from the
harddrive. I don't know whether that is normal though.
One thing for sure is that glxgears is taking up CPU cycles. Check:
Ignoring the first and last peak, the description for the CPU Load graph is:
Idle -> glxgears running -> idle
Anyway, The 'Failed to load module "GLcore" ' is still here, and so the search
to why continues. =/
Would you mind sending me your xorg.conf, Arnt?
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