its nvidia & I use compiz too.
# nvidia-xconfig: version 256.35 (buildmeis...@builder101) Wed Jun 16
19:25:59 PDT 2010
Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Module"
Load "glx"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "keyboard"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Device"
Identifier "Configured Video Device"
Driver "nvidia"
EndSection
it was always there in early versions of ubunu
--
graphics corruption
https://bugs.launchpad.net/bugs/607759
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