quake3: no hardware acceleration! - How to solve?!

[Strong]

I have ATI Radeon 9250 128Mb 128bit, Celeron 2,24GHz and 512Mb RAM.
I played many times in Quake3 but now get this:

$ quake3
...
couldn't exec q3config.cfg
couldn't exec autoexec.cfg
Hunk_Clear: reset the hunk ok
...
...loading libGL.so.1: 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
Using 4/4/4 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 (3)
----- CL_Shutdown -----
RE_Shutdown( 1 )
Sys_Error: GLimp_Init() - could not load OpenGL subsystem

How to resume playing?! - Thank You!

-- 
Best regards,
Strong.