I fix it.

Edit xorg.conf file.
start at # line.
and restart x then can set Visual Effects.

Thanks.

file xorg.conf
-----------------------------------------------------------------------------------
...
Section "Monitor"
        Identifier      "Configured Monitor"
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Monitor         "Configured Monitor"
        Device          "Configured Video Device"
#       SubSection "Display"
#               Virtual 2800 1050
#       EndSubSection
EndSection
...
-----------------------------------------------------------------------------------

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intel 945gm graphics card no 3d acceleration
https://bugs.launchpad.net/bugs/354698
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