Problem running Penumbra Overture

Code:

[matteo@archbox penumbra]$ ./penumbrademo

libGL warning: 3D driver claims to not support visual 0x42

Penumbra exited unexpectedly, please check

/home/matteo/.frictionalgames/Penumbra Overture/Episode1/hpl.log

for any error messages

Also try running

ulimit -c unlimited

And re-running Penumbra and try and recreate the error

then submit the generated core file or stack trace

/home/matteo/Programmi/penumbra

Code:

-------- THE HPL ENGINE LOG ------------



Creating Engine Modules

--------------------------------------------------------

 Creating graphics module

 Creating system module

 Creating resource module

 Creating input module

 Creating sound module

 Creating physics module

 Creating ai module

 Creating scene module

--------------------------------------------------------



Initializing Resources Module

--------------------------------------------------------

 Creating resource managers

 Misc Creation

--------------------------------------------------------



Initializing Graphics Module

--------------------------------------------------------

 Init low level graphics

 Setting video mode: 800 x 600 - 32 bpp

ERROR: Could not set display mode setting a lower one!

FATAL ERROR: Unable to initialize display!

Deleting ATI shader to 0