[XFree86] A problem about my X installation

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Dear Sir or Madam:
     Sorry to trouble you.
     I have installed the redhat and suse in my desktop, but there is
a display problem about my Monitor:
     I can only enter into the X by 640x480 with 16 depth. If I config
it into 1024x768(with 16 depth) in XF86config and then type "startx",
the error message appear saying that there are no mode about it.
However, I can use 1024x768 with 24 depth in windows XP. Is there
anyone who can tell me the reason?
     My video card is Intel 845 and the monitor is Dell E151FPb which
is a Flat Panel monitor. The resoluation of it is in below:

Horizontal scan range
 30 kHz to 61 kHz (automatic)

Vertical scan range
 56 Hz to 76 Hz (automatic)

Optimal preset resolution
 1024 x 768 at 60 Hz

Highest preset resolution
 1024 x 768 at 75 Hz

And you can also find its Specifications in
http://docs.us.dell.com/docs/monitors/E151FPB/English/specs.htm
     My XF86config file is in below, please help me check it.
Section "ServerFlags"
  Option       "AllowMouseOpenFail"
  Option       "RandR" "on"
EndSection

Section "Module"
  Load         "dbe"
  Load         "type1"
  Load         "speedo"
  Load         "freetype"
  Load         "extmod"
  Load         "glx"
  Load         "v4l"
  Load         "dri"
EndSection

Section "InputDevice"
  Driver       "Keyboard"
  Identifier   "Keyboard[0]"
  Option       "MapName" "Standard Keyboard [ pc104 ]"
  Option       "Protocol" "Standard"
  Option       "XkbLayout" "us"
  Option       "XkbModel" "pc104"
  Option       "XkbRules" "xfree86"
EndSection


Section "InputDevice"
  Driver       "mouse"
  Identifier   "Mouse[1]"
  Option       "ButtonNumber" "5"
  Option       "Device" "/dev/mouse"
  Option       "Name" "Autodetection"
  Option       "Protocol" "imps/2"
  Option       "Vendor" "Sysp"
  Option       "ZAxisMapping" "4 5"
EndSection


Section "Monitor"
  Option       "CalcAlgorithm" "CheckDesktopGeometry"
  HorizSync    30-61
  Identifier   "Monitor[0]"
  ModelName    "1024X LAPTOP DISPLAY PANEL"
  VendorName   "DELL"
  VertRefresh  56-76
  UseModes     "Modes[0]"
EndSection


Section "Modes"
  Identifier   "Modes[0]"
EndSection


Section "Screen"
  DefaultDepth 16
  SubSection "Display"
    Depth      15
    Modes      "640x480"
  EndSubSection
  SubSection "Display"
    Depth      16
    Modes      "1024x768" "800x600" "640x480"
  EndSubSection
  SubSection "Display"
    Depth      24
    Modes      "1024x768" "800x600" "640x480"
  EndSubSection
  SubSection "Display"
    Depth      32
    Modes      "640x480"
  EndSubSection
  SubSection "Display"
    Depth      8
    Modes      "640x480"
  EndSubSection
  Device       "Device[0]"
  Identifier   "Screen[0]"
  Monitor      "Monitor[0]"
EndSection


Section "Device"
  BoardName    "i845"
  BusID        "0:2:0"
  Driver       "i810"
  Identifier   "Device[0]"
  Screen       0
  Option       "Rotate" "off"
  VendorName   "Intel"
EndSection


Section "ServerLayout"
  Identifier   "Layout[all]"
  InputDevice  "Keyboard[0]" "CoreKeyboard"
  InputDevice  "Mouse[1]" "CorePointer"
  Option       "Clone" "off"
  Option       "Xinerama" "off"
  Screen       "Screen[0]"
EndSection

Section "DRI"
    Group      "video"
    Mode       0660
EndSection

     Thank you very much and I am looking forward to your reply.

Sincerely yours,
Yang



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