ayuda problemas al arrancar wolfstein:enemy territory

esto es lo que me dice

..loading libGL.so.1: Initializing OpenGL display
...setting mode 4: 800 600
Using XFree86-VidModeExtension Version 2.2
XF86DGA Mouse (Version 2.0) initialized
XFree86-VidModeExtension Activated at 800x600
Using 8/8/8 Color bits, 16 depth, 0 stencil display.
GL_RENDERER: Mesa GLX Indirect

***********************************************************
You are using software Mesa (no hardware acceleration)!
Driver DLL used: libGL.so.1
If this is intentional, add
"+set r_allowSoftwareGL 1"
to the command line when starting the game.
***********************************************************
...WARNING: could not set the given mode (4)
Initializing OpenGL display
...setting mode 3: 640 480
Using XFree86-VidModeExtension Version 2.2
XF86DGA Mouse (Version 2.0) initialized
XFree86-VidModeExtension Activated at 640x480
Received signal 11, exiting...