Problem running Penumbra Overture

[ilgufo]

Hi!
I'm trying the linux demo of Penumbra Overture but when I run it I get this error:

Code: (Select All)

[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

This is hpl.log:

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-------- 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

I'm on a i686 system, archlinux and a prosavage as video card.

What's the problem?

Thanks,

ilgufo