Screen Resolution on a Dell Inspiron 6400

[Ralph Thaller]

Hi!
i have a dell inspiron 6400 with ubuntu linux.
but i can only choose 1024x768 but the native adjustment is 1280x800.
this is my xorg.conf:
Section "Monitor"
        Identifier      "Standardbildschirm"
        Option          "DPMS"
        HorizSync    31.5 - 90.0
        VertRefresh  60.0 - 90.0
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "ATI Technologies, Inc. ATI Default Card"
        Monitor         "Standardbildschirm"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1280x960" "1280x854" "1280x800" "1280x768"
"1200x800" "1152x864" "1152x768" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           4
                Modes           "1280x960" "1280x854" "1280x800" "1280x768"
"1200x800" "1152x864" "1152x768" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1280x960" "1280x854" "1280x800" "1280x768"
"1200x800" "1152x864" "1152x768" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1280x960" "1280x854" "1280x800" "1280x768"
"1200x800" "1152x864" "1152x768" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1280x960" "1280x854" "1280x800" "1280x768"
"1200x800" "1152x864" "1152x768" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1280x960" "1280x854" "1280x800" "1280x768"
"1200x800" "1152x864" "1152x768" "1024x768" "800x600" "640x480"
        EndSubSection
EndSection

has anyone an idea how i can choose a higher resolution?

thx, Ralph
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