I always ask for help, in this case perhaps I could be usefull for someone
Here it is the XF86config that finally works fine to have X and tune them:
THE MOST TRICKY PART IS THE MODELINE LINE, till I didn't find the right one, no way to have X in YDL 4.0 and not all in YDL 3.01 nor mandrake nor gentoo also for ubuntu was fine, but is still quite a development distribution
# XFree86 4 configuration created by system-config-display
Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "unix/:7100"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"
#Load "dri"
EndSection
Section "InputDevice"
# Change "XkbModel" to "macintosh_old" if you are using
# the deprecated adb keycodes.
Identifier "Keyboard0"
Driver "keyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "macintosh"
Option "XkbLayout" "es"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "ZAxisMapping" "4 5"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
# Option "Emulate3Buttons" "true"
EndSection
Section "Monitor"
#Modeline "1280x960" 122.25 1280 1320 1424 1696 960 961 964 1002 +hsync +vsync -csync
Identifier "Monitor0"
ModelName "Apple eMac"
HorizSync 71.0 - 73.0
VertRefresh 70.0 - 140.0
ModeLine "1280x960" 122.2 1280 1344 1448 1696 960 961 964 1002 +hsync +vsync -csync
Option "DPMS"
EndSection
Section "Device"
Identifier "Card0"
Driver "nv"
BoardName "NVIDIA GeForce 2 MX (generic)"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 8
Modes "1280x960" "1024x768"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x960" "1024x768"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x960" "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "DRI"
Group 0
Mode 0666
EndSection