Olá ucastrobr, obrigado pela atençao.
Fiz o que vc me disse mas deu pau aqui, acho que esta em conflito alguma coisa, onde sou leigo e nao conseguirei resolver só, ficou desse jeito a resposta dos comandos que me passou e meu xorg:
lamartine@lamartine-desktop:~$ compiz --replace -c emerald &
[1] 5973
lamartine@lamartine-desktop:~$ Checking for Xgl: not present.
Detected PCI ID for VGA: 01:00.0 0300: 10de:0221 (rev a1) (prog-if 00 [VGA])
Checking for texture_from_pixmap: present.
Checking for non power of two support: present.
Checking for Composite extension: present.
Comparing resolution (1024x768) to maximum 3D texture size (4096): Passed.
Checking for nVidia: present.
Checking for FBConfig: present.
Checking for Xgl: not present.
Starting emerald
/usr/bin/compiz.real (core) - Warn: Unknown option '-c'
/usr/bin/compiz.real (core) - Error: Couldn't load plugin 'emerald'
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 image format
Aborted (core dumped)
metacity: Opção -c desconhecida
Segundo comando, qdo dado ele reinicia o gnome, vai p/ tela de login:
lamartine@lamartine-desktop:~$ compiz --replace --indirec-rendering
Checking for Xgl: not present.
Detected PCI ID for VGA: 01:00.0 0300: 10de:0221 (rev a1) (prog-if 00 [VGA])
Checking for texture_from_pixmap: present.
Checking for non power of two support: present.
Checking for Composite extension: present.
Comparing resolution (1024x768) to maximum 3D texture size (4096): Passed.
Checking for nVidia: present.
Checking for FBConfig: present.
Checking for Xgl: not present.
Starting emerald
qdo chega no starting emerald ele reinicia o gnome.
e por ultimo meu xorg como vc orientou:
# xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "Files"
EndSection
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "abnt2"
Option "XkbLayout" "br"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "true"
EndSection
Section "InputDevice"
Driver "wacom"
Identifier "stylus"
Option "Device" "/dev/input/wacom"
Option "Type" "stylus"
Option "ForceDevice" "ISDV4"# Tablet PC ONLY
EndSection
Section "InputDevice"
Driver "wacom"
Identifier "eraser"
Option "Device" "/dev/input/wacom"
Option "Type" "eraser"
Option "ForceDevice" "ISDV4"# Tablet PC ONLY
EndSection
Section "InputDevice"
Driver "wacom"
Identifier "cursor"
Option "Device" "/dev/input/wacom"
Option "Type" "cursor"
Option "ForceDevice" "ISDV4"# Tablet PC ONLY
EndSection
Section "Device"
Identifier "nVidia Corporation NV44A [GeForce 6200]"
Driver "nvidia"
Busid "PCI:1:0:0"
Option "AddARGBVisuals" "True"
Option "AddARGBGLXVisuals" "True"
Option "NoLogo" "True"
EndSection
Section "Monitor"
Identifier "Studioworks"
Option "DPMS"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "nVidia Corporation NV44A [GeForce 6200]"
Monitor "Studioworks"
Defaultdepth 24
Option "AddARGBGLXVisuals" "True"
SubSection "Display"
Modes "1280x1024" "1024x768" "800x600" "720x450" "720x400" "640x480"
EndSubSection
EndSection
Section "ServerLayout"
Identifier "Default Layout"
screen "Default Screen"
Inputdevice "Generic Keyboard"
Inputdevice "Configured Mouse"
# Uncomment if you have a wacom tablet
# InputDevice "stylus" "SendCoreEvents"
# InputDevice "cursor" "SendCoreEvents"
# InputDevice "eraser" "SendCoreEvents"
EndSection
Section "Module"
Load "glx"
EndSection
Section "Extensions"
Option "Composite" "Enable"
EndSection
Mas uma vez muito obrigado!
Maeta