xset: unable open display " "

teebye

desktop: lxde

when  login system,system show this message"xset:unable  open display "" ".

the following is my xorg.conf, it should be auto-generated by "nvidia-settings"



**************************
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 256.53  (buildmeister@builder101)  Fri Aug 27 21:34:01 PDT 2010

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 1.0  (buildmeister@builder63)  Mon Mar 23 15:34:19 PST 2009
# File generated by xorgconfig.
#
# Copyright 2004 The X.Org Foundation
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
# The X.Org Foundation BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
# OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
# Except as contained in this notice, the name of The X.Org Foundation shall
# not be used in advertising or otherwise to promote the sale, use or other
# dealings in this Software without prior written authorization from
# The X.Org Foundation.
#
# **********************************************************************
# Refer to the xorg.conf(5) man page for details about the format of
# this file.
# **********************************************************************
# **********************************************************************
# Module section -- this  section  is used to specify
# which dynamically loadable modules to load.
# **********************************************************************
#
# **********************************************************************
# Files section.  This allows default font and rgb paths to be set
# **********************************************************************
# **********************************************************************
# Server flags section.
# **********************************************************************
# **********************************************************************
# Input devices
# **********************************************************************
# **********************************************************************
# Core keyboard's InputDevice section
# **********************************************************************
# **********************************************************************
# Core Pointer's InputDevice section
# **********************************************************************
# **********************************************************************
# Other input device sections
# this is optional and is required only if you
# are using extended input devices.  This is for example only.  Refer
# to the xorg.conf man page for a description of the options.
# **********************************************************************
#
# Section "InputDevice"
#    Identifier  "Mouse2"
#    Driver      "mouse"
#    Option      "rotocol"      "MouseMan"
#    Option      "Device"        "/dev/mouse2"
# EndSection
#
# Section "InputDevice"
#    Identifier "spaceball"
#    Driver     "magellan"
#    Option     "Device"        "/dev/cua0"
# EndSection
#
# Section "InputDevice"
#    Identifier "spaceball2"
#    Driver     "spaceorb"
#    Option     "Device"        "/dev/cua0"
# EndSection
#
# Section "InputDevice"
#    Identifier "touchscreen0"
#    Driver     "microtouch"
#    Option     "Device"        "/dev/ttyS0"
#    Option     "MinX"          "1412"
#    Option     "MaxX"          "15184"
#    Option     "MinY"          "15372"
#    Option     "MaxY"          "1230"
#    Option     "ScreenNumber"  "0"
#    Option     "ReportingMode" "Scaled"
#    Option     "ButtonNumber"  "1"
#    Option     "SendCoreEvents"
# EndSection
#
# Section "InputDevice"
#    Identifier "touchscreen1"
#    Driver     "elo2300"
#    Option     "Device"        "/dev/ttyS0"
#    Option     "MinX"          "231"
#    Option     "MaxX"          "3868"
#    Option     "MinY"          "3858"
#    Option     "MaxY"          "272"
#    Option     "ScreenNumber"  "0"
#    Option     "ReportingMode" "Scaled"
#    Option     "ButtonThreshold"       "17"
#    Option     "ButtonNumber"  "1"
#    Option     "SendCoreEvents"
# EndSection
# **********************************************************************
# Monitor section
# **********************************************************************
# Any number of monitor sections may be present
# **********************************************************************
# Graphics device section
# **********************************************************************
# Any number of graphics device sections may be present
# Standard VGA Device:
# Device configured by xorgconf
# **********************************************************************
# Screen sections
# **********************************************************************
# Any number of screen sections may be present.  Each describes
# the configuration of a single screen.  A single specific screen section
# may be specified from the X server command line with the "-screen"
# option.
# **********************************************************************
# ServerLayout sections.
# **********************************************************************
# Any number of ServerLayout sections may be present.  Each describes
# the way multiple screens are organised.  A specific ServerLayout
# section may be specified from the X server command line with the
# "-layout" option.  In the absence of this, the first section is used.
# When now ServerLayout section is present, the first Screen section
# is used alone.
# Section "DRI"
#    Mode 0666
# EndSection
#
#
#Section "InputDevice"
#    Identifier     "Synaptics Touchpad"
#    Driver         "synaptics"
#    Option         "SendCoreEvents" "true"
#    Option         "Device" "/dev/psaux/"
#    Option         "rotocol" "auto/dev"
#    Option         "HorizEdgeScroll" "0"
#    Option         "MaxTapTime" "0"
#EndSection

Section "ServerLayout"

# The Identifier line must be present
# Each Screen line specifies a Screen section name, and optionally
# the relative position of other screens.  The four names after
# primary screen name are the screens to the top, bottom, left and right
# of the primary screen.  In this example, screen 2 is located to the
# right of screen 1.
# Each InputDevice line specifies an InputDevice section name and
# optionally some options to specify the way the device is to be
# used.  Those options include "CorePointer", "CoreKeyboard" and
# "SendCoreEvents".
   #InputDevice    "Synaptics Touchpad"
    Identifier     "Default Layout"
    Screen      0  "Screen0" 0 0
    InputDevice    "Configured Mouse"
    InputDevice    "Generic Keyboard"
    Option         "AutoAddDevices" "False"
EndSection

Section "Files"

# Multiple FontPath entries are allowed (which are concatenated together),
# as well as specifying multiple comma-separated entries in one FontPath
# command (or a combination of both methods)
#
#    FontPath   "/usr/share/fonts/TTF"
#    FontPath   "/usr/lib/X11/fonts/local/"
#    FontPath   "/usr/lib/X11/fonts/misc/"
#    FontPath   "/usr/lib/X11/fonts/75dpi/:unscaled"
#    FontPath   "/usr/lib/X11/fonts/100dpi/:unscaled"
#    FontPath   "/usr/lib/X11/fonts/Type1/"
#    FontPath   "/usr/lib/X11/fonts/TrueType/"
#    FontPath   "/usr/lib/X11/fonts/freefont/"
#    FontPath   "/usr/lib/X11/fonts/75dpi/"
#    FontPath   "/usr/lib/X11/fonts/100dpi/"
# The module search path.  The default path is shown here.
#    ModulePath "/usr/lib/modules"
    FontPath        "/usr/share/fonts/misc"
    FontPath        "/usr/share/fonts/100dpi:unscaled"
    FontPath        "/usr/share/fonts/75dpi:unscaled"
    FontPath        "/usr/share/fonts/Type1"
    FontPath        "/usr/share/fonts/wenquanyi"
EndSection

Section "Module"

# This loads the DBE extension module.
# This loads the miscellaneous extensions module, and disables
# initialisation of the XFree86-DGA extension within that module.
# This loads the font modules
#    Load        "type1"
# This loads the GLX module
#    Load       "glx"
# This loads the DRI module
#    Load       "dri"
    Load           "dbe"          # Double buffer extension
    SubSection     "extmod"
        Option         "omit xfree86-dga"   # don't initialise the DGA extension
    EndSubSection
    Load           "freetype"
#    Load        "xtt"
    Load           "glx"
EndSection

Section "ServerFlags"
    Option         "Xinerama" "0"
EndSection

Section "InputDevice"

#    Option        "Xleds"      "1 2 3"
#    Option "LeftAlt"     "Meta"
#    Option "RightAlt"    "ModeShift"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults).  For example, for a non-U.S.
# keyboard, you will probably want to use:
#    Option "XkbModel"    "pc105"
# If you have a US Microsoft Natural keyboard, you can use:
#    Option "XkbModel"    "microsoft"
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
#    Option "XkbLayout"   "de"
# or:
#    Option "XkbLayout"   "de"
#    Option "XkbVariant"  "nodeadkeys"
#
# If you'd like to switch the positions of your capslock and
# control keys, use:
#    Option "XkbOptions"  "ctrl:swapcaps"
# These are the default XKB settings for Xorg
#    Option "XkbRules"    "xorg"
#    Option "XkbModel"    "pc105"
#    Option "XkbLayout"   "us"
#    Option "XkbVariant"  ""
#    Option "XkbOptions"  ""
#    Option "XkbDisable"
    Identifier     "Generic Keyboard"
    Driver         "kbd"
    Option         "CoreKeyboard"
# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
    Option         "XkbRules" "xorg"
    Option         "XkbModel" "pc105"
    Option         "XkbLayout" "us"
EndSection

Section "InputDevice"

# Identifier and driver
#    Option "Resolution"        "256"
# Baudrate and SampleRate are only for some Logitech mice. In
# almost every case these lines should be omitted.
#    Option "BaudRate"        "9600"
#    Option "SampleRate"        "150"
# Mouse wheel mapping.  Default is to map vertical wheel to buttons 4 & 5,
# horizontal wheel to buttons 6 & 7.   Change if your mouse has more than
# 3 buttons and you need to map the wheel to different button ids to avoid
# conflicts.
# Emulate3Timeout is the timeout in milliseconds (default is 50ms)
    Identifier     "Configured Mouse"
    Driver         "mouse"
    Option         "CorePointer"         # Microsoft compatible (2-button protocol)
    Option         "Device" "/dev/input/mice"
# Mouse-speed setting for PS/2 mouse.
    Option         "rotocol" "ImPs/2"
    Option         "ZAxisMapping" "4 5"
# Emulate3Buttons is an option for 2-button mice
    Option         "Emulate3Buttons"
#    Option "Emulate3Timeout"    "50"
# ChordMiddle is an option for some 3-button Logitech mice
    Option         "ChordMiddle"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Seiko"
    HorizSync       30.0 - 75.0
    VertRefresh     60.0
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8400M GS"
EndSection

Section "Screen"

#    Option         "TwinView" "0"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "metamodes" "nvidia-auto-select +0+0"
    Option         "NoLogo" "true"
    Option         "AddARGBGLXVisuals" "True"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Extensions"
    Option         "Composite" "Enable"
EndSection


**************************************


Thank you for your help,because i can not input chinese,so  i hope you can understand it.