Can't set refresh rate at 75 Hz. with resolution 1280x1024

[Jeroen Verhoeckx]

Hello xorg,

I'm using Ubuntu 6.06 and I want to use my monitor at
a resolution of 1280x1024 and have at least a refresh
rate of 75 Hz. I know that my monitor (Iyama Vision
Master Pro 411 or A705MT) is able to handle this
resolution and refresh rate. The problem is that I can
only use it at a resolution of 60 Hz. I placed this
question also on the Ubuntuforums but was on unable to
solve the problem. Now I'm hoping you could help me.
Here is my thread at the ubuntuforums:
http://www.ubuntuforums.org/showthread.php?t=196396

Do you know what is causing the problem and is there
an solution?

Thanks in advance,

Jeroen Verhoeckx, The Netherlands

Here is my current xorg.conf file:
---------------------------------------------------

# /etc/X11/xorg.conf (xorg X Window System server
configuration file)
#
# This file was generated by dexconf, the Debian X
Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the
/etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg
package upgrades *only*
# if it has not been modified since the last upgrade
of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be
automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Files"
	FontPath	"/usr/share/X11/fonts/misc"
	FontPath	"/usr/share/X11/fonts/cyrillic"
	FontPath	"/usr/share/X11/fonts/100dpi/:unscaled"
	FontPath	"/usr/share/X11/fonts/75dpi/:unscaled"
	FontPath	"/usr/share/X11/fonts/Type1"
	FontPath	"/usr/share/X11/fonts/100dpi"
	FontPath	"/usr/share/X11/fonts/75dpi"
	# path to defoma fonts
	FontPath
"/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
	Load	"bitmap"
	Load	"ddc"
	Load	"dri"
	Load	"extmod"
	Load	"freetype"
	Load	"glx"
	Load	"int10"
	Load	"type1"
	Load	"vbe"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc104"
	Option		"XkbLayout"	"us"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ExplorerPS/2"
	Option		"ZAxisMapping"		"4 5"
	Option		"Emulate3Buttons"	"true"
EndSection

Section "InputDevice"
  Driver        "wacom"
  Identifier    "stylus"
  Option        "Device"        "/dev/wacom"         
# Change to 
                                                     
# /dev/input/event
                                                     
# for USB
  Option        "Type"          "stylus"
  Option        "ForceDevice"   "ISDV4"              
# Tablet PC ONLY
EndSection

Section "InputDevice"
  Driver        "wacom"
  Identifier    "eraser"
  Option        "Device"        "/dev/wacom"         
# Change to 
                                                     
# /dev/input/event
                                                     
# for USB
  Option        "Type"          "eraser"
  Option        "ForceDevice"   "ISDV4"              
# Tablet PC ONLY
EndSection

Section "InputDevice"
  Driver        "wacom"
  Identifier    "cursor"
  Option        "Device"        "/dev/wacom"         
# Change to 
                                                     
# /dev/input/event
                                                     
# for USB
  Option        "Type"          "cursor"
  Option        "ForceDevice"   "ISDV4"              
# Tablet PC ONLY
EndSection

Section "Device"
	Identifier	"NVIDIA Corporation NV31 [GeForce FX
5600XT]"
	Driver		"nvidia"
	BusID		"PCI:1:0:0"
EndSection

Section "Monitor"
	Identifier	"vision master pro 411"
	Option		"DPMS"
	HorizSync	30-86
	VertRefresh	50-180
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"NVIDIA Corporation NV31 [GeForce FX 5600XT]"
	Monitor		"vision master pro 411"
	DefaultDepth	24
	SubSection "Display"
		Depth		1
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		4
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		8
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		15
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		16
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
	Screen		"Default Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
	InputDevice     "stylus" "SendCoreEvents"
	InputDevice     "cursor" "SendCoreEvents"
	InputDevice     "eraser" "SendCoreEvents"
EndSection

Section "DRI"
	Mode	0666
EndSection
--------------------------------------------------

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