si edita a mano il file di configurazione di X ..
prova a postare il tuo file xorg.conf, dentro /etc/X11
tra l'altro il modello di monitor è giusto ;)
# /.../
# SaX generated X11 config file
# Created on: 2006-09-19T23:52:39+0200.
#
# Version: 7.1
# Contact: Marcus Schaefer <
[email protected]>, 2005
# Contact: SaX-User list <https://lists.berlios.de/mailman/listinfo/sax-users>
#
# Automatically generated by [SaX2] (7.1)
# PLEASE DO NOT EDIT THIS FILE!
#
Section "Files"
FontPath "/usr/X11R6/lib/X11/fonts/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/local"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/URW"
FontPath "/usr/X11R6/lib/X11/fonts/Speedo"
FontPath "/usr/X11R6/lib/X11/fonts/PEX"
FontPath "/usr/X11R6/lib/X11/fonts/cyrillic"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/latin2/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/latin7/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/baekmuk:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/japanese:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/kwintv"
FontPath "/usr/X11R6/lib/X11/fonts/truetype"
FontPath "/usr/X11R6/lib/X11/fonts/uni:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/CID"
FontPath "/usr/X11R6/lib/X11/fonts/ucs/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/ucs/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/ucs/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/hellas/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/misc/sgi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/xtest"
FontPath "/opt/kde3/share/fonts"
InputDevices "/dev/gpmdata"
InputDevices "/dev/input/mice"
EndSection
Section "Module"
Load "type1"
Load "dbe"
Load "freetype"
Load "glx"
Load "v4l"
Load "extmod"
EndSection
Section "ServerFlags"
Option "AllowMouseOpenFail" "on"
EndSection
Section "InputDevice"
Driver "kbd"
Identifier "Keyboard[0]"
Option "Protocol" "Standard"
Option "XkbLayout" "it"
Option "XkbModel" "pc102"
Option "XkbRules" "xfree86"
EndSection
Section "InputDevice"
Driver "mouse"
Identifier "Mouse[1]"
Option "Buttons" "5"
Option "Device" "/dev/input/mice"
Option "Name" "Logitech Optical Mouse"
Option "Protocol" "explorerps/2"
Option "Vendor" "Sysp"
Option "ZAxisMapping" "4 5"
EndSection
Section "Monitor"
Option "CalcAlgorithm" "XServerPool"
DisplaySize 360 270
HorizSync 30-92
Identifier "Monitor[0]"
ModelName "PHILIPS 109E5"
Option "DPMS"
VendorName "PHL"
VertRefresh 43-160
UseModes "Modes[0]"
EndSection
Section "Modes"
Identifier "Modes[0]"
Modeline "1280x1024" 157.48 1280 1376 1512 1744 1024 1025 1028 1075
Modeline "1280x1024" 145.69 1280 1376 1512 1744 1024 1025 1028 1071
Modeline "1280x1024" 125.14 1280 1368 1504 1728 1024 1025 1028 1065
Modeline "1152x864" 142.04 1152 1232 1360 1568 864 865 868 915
Modeline "1152x864" 140.45 1152 1232 1360 1568 864 865 868 914
Modeline "1152x864" 125.43 1152 1232 1360 1568 864 865 868 909
Modeline "1152x864" 109.43 1152 1224 1352 1552 864 865 868 904
Modeline "1152x864" 93.90 1152 1224 1344 1536 864 865 868 899
Modeline "1024x768" 126.55 1024 1096 1208 1392 768 769 772 819
Modeline "1024x768" 122.97 1024 1096 1208 1392 768 769 772 818
Modeline "1024x768" 110.91 1024 1096 1208 1392 768 769 772 813
Modeline "1024x768" 97.84 1024 1088 1200 1376 768 769 772 808
Modeline "1024x768" 86.18 1024 1088 1200 1376 768 769 772 803
Modeline "1024x768" 73.89 1024 1080 1192 1360 768 769 772 799
Modeline "800x600" 97.59 800 856 944 1088 600 601 604 650
Modeline "800x600" 90.10 800 856 944 1088 600 601 604 647
Modeline "800x600" 82.55 800 856 944 1088 600 601 604 643
Modeline "800x600" 73.98 800 848 936 1072 600 601 604 639
Modeline "800x600" 66.71 800 848 936 1072 600 601 604 635
Modeline "800x600" 58.73 800 840 928 1056 600 601 604 632
Modeline "800x600" 51.73 800 840 928 1056 600 601 604 628
Modeline "800x600" 44.13 800 840 920 1040 600 601 604 624
Modeline "768x576" 89.56 768 824 904 1040 576 577 580 624
Modeline "768x576" 82.67 768 824 904 1040 576 577 580 621
Modeline "768x576" 75.72 768 824 904 1040 576 577 580 617
Modeline "768x576" 67.79 768 816 896 1024 576 577 580 613
Modeline "768x576" 61.21 768 816 896 1024 576 577 580 610
Modeline "768x576" 53.75 768 808 888 1008 576 577 580 606
Modeline "768x576" 47.41 768 808 888 1008 576 577 580 603
Modeline "768x576" 40.41 768 800 880 992 576 577 580 599
EndSection
Section "Device"
BoardName "GeForce 7600 GS"
BusID "1:0:0"
Driver "nvidia"
Option "AllowGLXWhithComposite" "true"
Option "RenderAccel" "true"
Identifier "Device[0]"
VendorName "NVidia"
EndSection
Section "Screen"
DefaultDepth 24
SubSection "Display"
Depth 15
Modes "1280x1024" "1152x864" "1024x768" "800x600" "768x576"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x1024" "1152x864" "1024x768" "800x600" "768x576"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x1024" "1152x864" "1024x768" "800x600" "768x576"
EndSubSection
SubSection "Display"
Depth 8
Modes "1280x1024" "1152x864" "1024x768" "800x600" "768x576"
EndSubSection
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[0]"
EndSection
Section "ServerLayout"
Identifier "Layout[all]"
InputDevice "Keyboard[0]" "CoreKeyboard"
InputDevice "Mouse[1]" "CorePointer"
Screen "Screen[0]"
EndSection
Section "DRI"
Group "video"
Mode 0660
EndSection