X41 3d Beschleunigung

libgl1-mesa-dri installed?

glxinfo | grep "direct rendering"

(EE) intel(0): Cannot support DRI with frame buffer width > 2048.

this patch should solve the problem:
        DefaultDepth    24
        SubSection "Display"
                Depth           24
-               Modes           "1024x768" "1280x1024"
-               Virtual         2560 1280
+               Modes           "1024x768"
        EndSubSection
 EndSection