Xorg + Xfce4 resolution problem

[Sniper]

Hi!

When i set in xorg.conf resolution 1280x1024 displey don't show whole
desktop. 1280x1024 is native resolution for my LCD Prestigion P171.

It look like

http://www.shrani.si/f/1c/PU/2feOamWG/photo098.jpg



If i set resolution 1024x768 then show whole desktob but fonts and panel
beacome blur (not clear).

Using Xorg  7.4_1 and Xfce 4.6.0

Here is my xorg.conf


Section "ServerLayout"
    Identifier     "X.org Configured"
    Screen      0  "Screen0" 0 0
    InputDevice    "Mouse0" "CorePointer"
    InputDevice    "Keyboard0" "CoreKeyboard"
EndSection


Section "Files"
    ModulePath   "/usr/local/lib/xorg/modules"
    FontPath     "/usr/local/lib/X11/fonts/misc/"
    FontPath     "/usr/local/lib/X11/fonts/TTF/"
    FontPath     "/usr/local/lib/X11/fonts/OTF"
    FontPath     "/usr/local/lib/X11/fonts/Type1/"
    FontPath     "/usr/local/lib/X11/fonts/100dpi/"
    FontPath     "/usr/local/lib/X11/fonts/75dpi/"
EndSection

Section "Module"
    Load  "extmod"
    Load  "record"
    Load  "dbe"
    Load  "glx"
    Load  "dri"
    Load  "dri2"
EndSection

Section "InputDevice"
    Identifier  "Keyboard0"
    Driver      "kbd"
EndSection

Section "InputDevice"
    Identifier  "Mouse0"
    Driver      "mouse"
    Option        "Protocol" "auto"
    Option        "Device" "/dev/sysmouse"
    Option        "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
    #DisplaySize      330   270    # mm
    Identifier   "Monitor0"
    VendorName   "ASB"
    ModelName    " P171"
        HorizSync    31.5 - 80.0
        VertRefresh  60.0 - 60.0
    Option        "DPMS"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
        ### [arg]: arg optional
        #Option     "SWcursor"               # [<bool>]
        #Option     "HWcursor"               # [<bool>]
        #Option     "NoAccel"                # [<bool>]
        #Option     "ShadowFB"               # [<bool>]
        #Option     "UseFBDev"               # [<bool>]
        #Option     "Rotate"                 # [<str>]
        #Option     "VideoKey"               # <i>
        #Option     "FlatPanel"              # [<bool>]
        #Option     "FPDither"               # [<bool>]
        #Option     "CrtcNumber"             # <i>
        #Option     "FPScale"                # [<bool>]
        #Option     "FPTweak"                # <i>
        #Option     "DualHead"               # [<bool>]
    Identifier  "Card0"
    Driver      "nv"
    VendorName  "nVidia Corporation"
    BoardName   "NV11 [GeForce2 MX/MX 400]"
    BusID       "PCI:1:0:0"
EndSection


Section "Screen"
        Identifier "Screen0"
        Device     "Card0"
        Monitor    "Monitor0"
#        SubSection "Display"
#                Viewport   0 0
#                Depth     1
#         Modes     "1280x1024"
#        EndSubSection
#        SubSection "Display"
#                Viewport   0 0
#                Depth     4
#         Modes     "1280x1024"
#        EndSubSection
#        SubSection "Display"
#                Viewport   0 0
#                Depth     8
#         Modes     "1280x1024"
#        EndSubSection
#        SubSection "Display"
#                Viewport   0 0
#                Depth     15
#        Modes     "1280x1024"
#        EndSubSection
#        SubSection "Display"
#                Viewport   0 0
#                Depth     16
#        Modes     "1280x1024"
#        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     16
        Modes     "1280x1024"
        EndSubSection
EndSection





Thanks for any advice



Note: at 1280x1024 fonts are clear!