Mandriva 2007: xgl marche pas ! - nvidia 6800

Bon, après avoir installé les pilotes nvidia sur une Mandriva Free 2007 avec noyau 2.6.17-5mdv, j'ai essayé d'avoir xgl via le MCC. Tout s'installe correctement (compiz, xserver-glx, mesa...), sauf que je n'ai que xgl de valide, aixgl est grisé. N'y connaissant rien, je ne touche pas au règlages proposés dans compiz, je valide et redémarre le serveur X: gdm apparait normalement, je lance ma session gnome et... pas de gestionnaire de fenètres.

Gnome se lance, mais quand je lance une application, elle n'a pas de bordures ni de barre de titres. Je ne peux donc pas la déplacer, ni la fermer... (sauf gnome-terminal qui se ferme via exit).

Quand je lance compiz dans le terminal, il me dit:
glXBindTexImageEXT is missing
compiz: Failed to manage screen: 0
compiz: No managable screens found on display :93.0

mon xorg.conf :

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder3) Tue Aug 1 21:11:12 PDT 2006

# File generated by XFdrake (rev 57713)
# **********************************************************************
# Refer to the xorg.conf man page for details about the format of
# this file.
# **********************************************************************

Section "ServerLayout"
Identifier "layout1"
Screen "screen1" 0 0
InputDevice "Keyboard1" "CoreKeyboard"
InputDevice "Mouse1" "CorePointer"
EndSection

Section "Files"

# font server independent of the X server to render fonts.
# minimal fonts to allow X to run without xfs
FontPath "unix/:-1"
FontPath "/usr/share/fonts/misc:unscaled"
EndSection

Section "Module"
Load "dbe" # Double-Buffering Extension
Load "v4l" # Video for Linux
Load "extmod"
Load "type1"
Load "freetype"
Load "glx" # 3D layer
EndSection

Section "ServerFlags"

#DontZap # disable <Crtl><Alt><BS> (server abort)
# allows the server to start up even if the mouse does not work
#DontZoom # disable <Crtl><Alt><KP_+>/<KP_-> (resolution switching)
Option "allowmouseopenfail"
EndSection

Section "InputDevice"
Identifier "Keyboard1"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "fr"
Option "XkbOptions" "compose:rwin"
EndSection

Section "InputDevice"
Identifier "Mouse1"
Driver "mouse"
Option "Protocol" "ExplorerPS/2"
Option "Device" "/dev/mouse"
EndSection

Section "Monitor"

# TV fullscreen mode or DVD fullscreen output.
# 768x576 @ 79 Hz, 50 kHz hsync
Identifier "monitor1"
VendorName "Mitsubishi"
ModelName "Mitsubishi Diamond Plus 230SB"
HorizSync 30.0 - 115.0
VertRefresh 50.0 - 160.0
ModeLine "768x576" 50.0 768 832 846 1000 576 590 595 630
ModeLine "768x576" 63.1 768 800 960 1024 576 578 590 616
EndSection

Section "Device"
Identifier "device1"
Driver "nvidia"
VendorName "nVidia Corp."
BoardName "NVIDIA GeForce 6800 (generic)"
EndSection

Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "monitor1"
DefaultDepth 24
Option "DPMS"
SubSection "Display"
Depth 8
Modes "1600x1200" "1400x1050" "1280x1024" "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubSection
SubSection "Display"
Depth 15
Modes "1600x1200" "1400x1050" "1280x1024" "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubSection
SubSection "Display"
Depth 16
Modes "1600x1200" "1400x1050" "1280x1024" "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubSection
SubSection "Display"
Depth 24
Modes "1600x1200" "1400x1050" "1280x1024" "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubSection
EndSection

Section "Extensions"
Option "Composite"
EndSection

Pourtant j'utilise "nvidia" dans xorg.conf et le logo nvidia apparit au lancement de gdm.

comment m'en sortir ?

Merci