Вопрос по Beryl-у

beryl-manager
kolya@nickolay:~$ **************************************************************
* Beryl system compatiblity check                            *
**************************************************************

Detected xserver                                : NVIDIA

Checking Display :0.0 ...

Checking for XComposite extension               : passed (v0.3)
Checking for XDamage extension                  : passed
Checking for RandR extension                    : passed
Checking for XSync extension                    : passed

Checking Screen 0 ...

Checking for GLX_SGIX_fbconfig                  : passed
Checking for GLX_EXT_texture_from_pixmap        : failed

No GLX_EXT_texture_from_pixmap
beryl: No GLXFBConfig for default depth, falling back on visinfo.

Что это может быть за расширение?

============= [xorg.conf] =============
...
Section "Module"
...
    Load           "glx"
...
EndSection

Section "Device"
    Identifier     "XXX"
    Driver         "nvidia"
    Option "RenderAccel" "true"
    Option "NoRenderExtension" "false"
    Option "SWCursor" "false"
    Option "HWCursor" "true"
    Option "AllowGLXWithComposite" "true" # For Beryl
EndSection

Section "Extensions"
        Option "Composite" "Enable" # For Beryl
EndSection

Section "Screen"
    Identifier     "Default Screen"
    Device         "XXX"
    Monitor        "LCD1970NX"
    DefaultDepth    24
    Option         "AddARGBGLXVisuals" "True" # For Beryl
...
EndSection
============= [xorg.conf] =============