voila un des  xorg.confutilisés

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "LG Electronics"
    ModelName      "F700P"
    HorizSync       30.0 - 98.0
    VertRefresh     50.0 - 160.0
    Option         "DPMS"

EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
#    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    32
    SubSection     "Display"
        Depth       32
        Modes      "1280x1024_85.00"

    EndSubSection
EndSection
--------------------------------------------------------------------------------------------------------------------------------------------------------------
et /var/log/Xorg.0

[    81.205]
X.Org X Server 1.11.3
Release Date: 2011-12-16
[    81.206] X Protocol Version 11, Revision 0
[    81.206] Build Operating System: Linux 2.6.42-23-generic x86_64 Ubuntu
[    81.206] Current Operating System: Linux jplin-Lenovo-Product 3.2.0-31-generic #50-Ubuntu SMP Fri Sep 7 16:16:45 UTC 2012 x86_64
[    81.206] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-31-generic root=UUID=03e39e9d-4d1e-41fe-af8d-57e5a96e07a9 ro recovery nomodeset
[    81.207] Build Date: 29 August 2012  12:12:33AM
[    81.207] xorg-server 2:1.11.4-0ubuntu10.8 (For technical support please see http://www.ubuntu.com/support)
[    81.207] Current version of pixman: 0.24.4
[    81.208]     Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
[    81.208] Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    81.209] (==) Log file: "/var/log/Xorg.0.log", Time: Thu Oct 11 13:51:24 2012
[    81.209] (II) Loader magic: 0x7f714a852b00
[    81.209] (II) Module ABI versions:
[    81.209]     X.Org ANSI C Emulation: 0.4
[    81.209]     X.Org Video Driver: 11.0
[    81.209]     X.Org XInput driver : 16.0
[    81.209]     X.Org Server Extension : 6.0
[    81.210] (--) PCI:*(0:1:0:0) 10de:1049:1642:3a98 rev 161, Mem @ 0xf6000000/16777216, 0xe8000000/134217728, 0xf0000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/524288
[    81.210] List of video drivers:
[    81.210]     cirrus
[    81.211]     tseng
[    81.211]     mach64
[    81.211]     ati
[    81.211]     openchrome
[    81.212]     i128
[    81.212]     s3virge
[    81.212]     tdfx
[    81.212]     savage
[    81.213]     sisusb
[    81.213]     nouveau
[    81.213]     s3
[    81.213]     neomagic
[    81.214]     intel
[    81.214]     mga
[    81.214]     apm
[    81.214]     vmware
[    81.215]     chips
[    81.215]     voodoo
[    81.215]     sis
[    81.215]     rendition
[    81.216]     siliconmotion
[    81.216]     trident
[    81.216]     ark
[    81.216]     radeon
[    81.217]     qxl
[    81.217]     r128
[    81.217]     fbdev
[    81.217]     vesa
[    81.217] (II) LoadModule: "cirrus"
[    81.217] (II) Loading /usr/lib/xorg/modules/drivers/cirrus_drv.so
[    81.232] (II) Module cirrus: vendor="X.Org Foundation"
[    81.232]     compiled for 1.11.3, module version = 1.3.2
[    81.232]     Module class: X.Org Video Driver
[    81.232]     ABI class: X.Org Video Driver, version 11.0
[    81.232] (II) LoadModule: "tseng"
[    81.232] (II) Loading /usr/lib/xorg/modules/drivers/tseng_drv.so
[    81.245] (II) Module tseng: vendor="X.Org Foundation"
[    81.245]     compiled for 1.11.3, module version = 1.1.0
[    81.245]     Module class: X.Org Video Driver
[    81.245]     ABI class: X.Org Video Driver, version 11.0
[    81.245] (II) LoadModule: "mach64"
[    81.245] (II) Loading /usr/lib/xorg/modules/drivers/mach64_drv.so
[    81.251] (II) Module mach64: vendor="X.Org Foundation"
[    81.251]     compiled for 1.11.3, module version = 6.9.0
[    81.251]     Module class: X.Org Video Driver
[    81.251]     ABI class: X.Org Video Driver, version 11.0
[    81.251] (II) LoadModule: "ati"
[    81.251] (II) Loading /usr/lib/xorg/modules/drivers/ati_drv.so
[    81.256] (II) Module ati: vendor="X.Org Foundation"
[    81.256]     compiled for 1.11.3, module version = 6.14.99
[    81.256]     Module class: X.Org Video Driver
[    81.256]     ABI class: X.Org Video Driver, version 11.0
[    81.256] (II) LoadModule: "openchrome"
[    81.256] (II) Loading /usr/lib/xorg/modules/drivers/openchrome_drv.so
[    81.273] (II) Module openchrome: vendor="http://openchrome.org/"
[    81.273]     compiled for 1.11.3, module version = 0.2.904
[    81.273]     Module class: X.Org Video Driver
[    81.273]     ABI class: X.Org Video Driver, version 11.0
[    81.273] (II) LoadModule: "i128"
[    81.273] (II) Loading /usr/lib/xorg/modules/drivers/i128_drv.so
[    81.273] (II) Module i128: vendor="X.Org Foundation"
[    81.273]     compiled for 1.11.3, module version = 1.3.4
[    81.273]     Module class: X.Org Video Driver
[    81.273]     ABI class: X.Org Video Driver, version 11.0
[    81.273] (II) LoadModule: "s3virge"
[    81.274] (II) Loading /usr/lib/xorg/modules/drivers/s3virge_drv.so
[    81.274] (II) Module s3virge: vendor="X.Org Foundation"
[    81.274]     compiled for 1.11.3, module version = 1.10.4
[    81.274]     Module class: X.Org Video Driver
[    81.274]     ABI class: X.Org Video Driver, version 11.0
[    81.274] (II) LoadModule: "tdfx"
[    81.274] (II) Loading /usr/lib/xorg/modules/drivers/tdfx_drv.so
[    81.288] (II) Module tdfx: vendor="X.Org Foundation"
[    81.288]     compiled for 1.11.3, module version = 1.4.3
[    81.288]     Module class: X.Org Video Driver
[    81.288]     ABI class: X.Org Video Driver, version 11.0
[    81.288] (II) LoadModule: "savage"
[    81.288] (II) Loading /usr/lib/xorg/modules/drivers/savage_drv.so
[    81.295] (II) Module savage: vendor="X.Org Foundation"
[    81.295]     compiled for 1.11.3, module version = 2.3.3
[    81.295]     Module class: X.Org Video Driver
[    81.295]     ABI class: X.Org Video Driver, version 11.0
[    81.295] (II) LoadModule: "sisusb"
[    81.295] (II) Loading /usr/lib/xorg/modules/drivers/sisusb_drv.so
[    81.308] (II) Module sisusb: vendor="X.Org Foundation"
[    81.308]     compiled for 1.11.3, module version = 0.9.4
[    81.308]     Module class: X.Org Video Driver
[    81.308]     ABI class: X.Org Video Driver, version 11.0
[    81.308] (II) LoadModule: "nouveau"
[    81.308] (II) Loading /usr/lib/xorg/modules/drivers/nouveau_drv.so
[    81.328] (II) Module nouveau: vendor="X.Org Foundation"
[    81.328]     compiled for 1.11.3, module version = 0.0.16
[    81.328]     Module class: X.Org Video Driver
[    81.328]     ABI class: X.Org Video Driver, version 11.0
[    81.328] (II) LoadModule: "s3"
[    81.328] (II) Loading /usr/lib/xorg/modules/drivers/s3_drv.so
[    81.342] (II) Module s3: vendor="X.Org Foundation"
[    81.342]     compiled for 1.11.3, module version = 0.6.3
[    81.342]     Module class: X.Org Video Driver
[    81.342]     ABI class: X.Org Video Driver, version 11.0
[    81.342] (II) LoadModule: "neomagic"
[    81.342] (II) Loading /usr/lib/xorg/modules/drivers/neomagic_drv.so
[    81.347] (II) Module neomagic: vendor="X.Org Foundation"
[    81.347]     compiled for 1.11.3, module version = 1.2.5
[    81.347]     Module class: X.Org Video Driver
[    81.347]     ABI class: X.Org Video Driver, version 11.0
[    81.347] (II) LoadModule: "intel"
[    81.347] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
[    81.369] (II) Module intel: vendor="X.Org Foundation"
[    81.369]     compiled for 1.11.3, module version = 2.17.0
[    81.369]     Module class: X.Org Video Driver
[    81.369]     ABI class: X.Org Video Driver, version 11.0
[    81.369] (II) LoadModule: "mga"
[    81.369] (II) Loading /usr/lib/xorg/modules/drivers/mga_drv.so
[    81.378] (II) Module mga: vendor="X.Org Foundation"
[    81.378]     compiled for 1.11.3, module version = 1.4.13
[    81.378]     Module class: X.Org Video Driver
[    81.378]     ABI class: X.Org Video Driver, version 11.0
[    81.378] (II) LoadModule: "apm"
[    81.378] (II) Loading /usr/lib/xorg/modules/drivers/apm_drv.so
[    81.390] (II) Module apm: vendor="X.Org Foundation"
[    81.390]     compiled for 1.11.3, module version = 1.2.3
[    81.390]     Module class: X.Org Video Driver
[    81.390]     ABI class: X.Org Video Driver, version 11.0
[    81.390] (II) LoadModule: "vmware"
[    81.390] (II) Loading /usr/lib/xorg/modules/drivers/vmware_drv.so
[    81.424] (II) Module vmware: vendor="X.Org Foundation"
[    81.425]     compiled for 1.11.3, module version = 12.0.1
[    81.425]     Module class: X.Org Video Driver
[    81.425]     ABI class: X.Org Video Driver, version 11.0
[    81.425] (II) LoadModule: "chips"
[    81.425] (II) Loading /usr/lib/xorg/modules/drivers/chips_drv.so
[    81.437] (II) Module chips: vendor="X.Org Foundation"
[    81.437]     compiled for 1.11.3, module version = 1.2.4
[    81.437]     Module class: X.Org Video Driver
[    81.437]     ABI class: X.Org Video Driver, version 11.0
[    81.437] (II) LoadModule: "voodoo"
[    81.437] (II) Loading /usr/lib/xorg/modules/drivers/voodoo_drv.so
[    81.450] (II) Module voodoo: vendor="X.Org Foundation"
[    81.450]     compiled for 1.11.3, module version = 1.1.0
[    81.450]     Module class: X.Org Video Driver
[    81.450]     ABI class: X.Org Video Driver, version 11.0
[    81.450] (II) LoadModule: "sis"
[    81.450] (II) Loading /usr/lib/xorg/modules/drivers/sis_drv.so
[    81.469] (II) Module sis: vendor="X.Org Foundation"
[    81.469]     compiled for 1.11.3, module version = 0.10.3
[    81.469]     Module class: X.Org Video Driver
[    81.469]     ABI class: X.Org Video Driver, version 11.0
[    81.469] (II) LoadModule: "rendition"
[    81.469] (II) Loading /usr/lib/xorg/modules/drivers/rendition_drv.so
[    81.470] (II) Module rendition: vendor="X.Org Foundation"
[    81.470]     compiled for 1.11.3, module version = 4.2.4
[    81.470]     Module class: X.Org Video Driver
[    81.470]     ABI class: X.Org Video Driver, version 11.0
[    81.470] (II) LoadModule: "siliconmotion"
[    81.470] (II) Loading /usr/lib/xorg/modules/drivers/siliconmotion_drv.so
[    81.482] (II) Module siliconmotion: vendor="X.Org Foundation"
[    81.482]     compiled for 1.11.3, module version = 1.7.5
[    81.482]     Module class: X.Org Video Driver
[    81.482]     ABI class: X.Org Video Driver, version 11.0
[    81.482] (II) LoadModule: "trident"
[    81.482] (II) Loading /usr/lib/xorg/modules/drivers/trident_drv.so
[    81.487] (II) Module trident: vendor="X.Org Foundation"
[    81.487]     compiled for 1.11.3, module version = 1.3.4
[    81.487]     Module class: X.Org Video Driver
[    81.487]     ABI class: X.Org Video Driver, version 11.0
[    81.487] (II) LoadModule: "ark"
[    81.487] (II) Loading /usr/lib/xorg/modules/drivers/ark_drv.so
[    81.492] (II) Module ark: vendor="X.Org Foundation"
[    81.492]     compiled for 1.11.3, module version = 0.7.3
[    81.492]     Module class: X.Org Video Driver
[    81.492]     ABI class: X.Org Video Driver, version 11.0
[    81.492] (II) LoadModule: "radeon"
[    81.493] (II) Loading /usr/lib/xorg/modules/drivers/radeon_drv.so
[    81.534] (II) Module radeon: vendor="X.Org Foundation"
[    81.534]     compiled for 1.11.3, module version = 6.14.99
[    81.534]     Module class: X.Org Video Driver
[    81.534]     ABI class: X.Org Video Driver, version 11.0
[    81.535] (II) LoadModule: "qxl"
[    81.535] (II) Loading /usr/lib/xorg/modules/drivers/qxl_drv.so
[    81.550] (II) Module qxl: vendor="X.Org Foundation"
[    81.550]     compiled for 1.11.3, module version = 0.0.0
[    81.550]     Module class: X.Org Video Driver
[    81.550]     ABI class: X.Org Video Driver, version 11.0
[    81.550] (II) LoadModule: "r128"
[    81.550] (II) Loading /usr/lib/xorg/modules/drivers/r128_drv.so
[    81.556] (II) Module r128: vendor="X.Org Foundation"
[    81.556]     compiled for 1.11.3, module version = 6.8.1
[    81.556]     Module class: X.Org Video Driver
[    81.556]     ABI class: X.Org Video Driver, version 11.0
[    81.556] (II) LoadModule: "fbdev"
[    81.556] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[    81.557] (II) Module fbdev: vendor="X.Org Foundation"
[    81.557]     compiled for 1.11.3, module version = 0.4.2
[    81.557]     ABI class: X.Org Video Driver, version 11.0
[    81.557] (II) LoadModule: "vesa"
[    81.557] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[    81.557] (II) Module vesa: vendor="X.Org Foundation"
[    81.557]     compiled for 1.11.3, module version = 2.3.0
[    81.557]     Module class: X.Org Video Driver
[    81.557]     ABI class: X.Org Video Driver, version 11.0
[    81.557] (WW) Falling back to old probe method for cirrus
[    81.557] (II) Loading sub module "cirrus_laguna"
[    81.557] (II) LoadModule: "cirrus_laguna"
[    81.557] (II) Loading /usr/lib/xorg/modules/drivers/cirrus_laguna.so
[    81.558] (II) Module cirrus_laguna: vendor="X.Org Foundation"
[    81.558]     compiled for 1.11.3, module version = 1.0.0
[    81.558]     ABI class: X.Org Video Driver, version 11.0
[    81.558] (II) Loading sub module "cirrus_alpine"
[    81.558] (II) LoadModule: "cirrus_alpine"
[    81.558] (II) Loading /usr/lib/xorg/modules/drivers/cirrus_alpine.so
[    81.558] (II) Module cirrus_alpine: vendor="X.Org Foundation"
[    81.558]     compiled for 1.11.3, module version = 1.0.0
[    81.558]     ABI class: X.Org Video Driver, version 11.0
[    81.558] (WW) Falling back to old probe method for tseng
[    81.558] (WW) Falling back to old probe method for i128
[    81.558] (WW) Falling back to old probe method for s3virge
[    81.558] (WW) Falling back to old probe method for sisusb
[    81.558] (II) NOUVEAU driver Date:   Wed Nov 30 18:56:54 2011 +0100
[    81.558] (II) NOUVEAU driver for NVIDIA chipset families :
[    81.558]     RIVA TNT        (NV04)
[    81.558]     RIVA TNT2       (NV05)
[    81.558]     GeForce 256     (NV10)
[    81.558]     GeForce 2       (NV11, NV15)
[    81.558]     GeForce 4MX     (NV17, NV18)
[    81.558]     GeForce 3       (NV20)
[    81.558]     GeForce 4Ti     (NV25, NV28)
[    81.558]     GeForce FX      (NV3x)
[    81.558]     GeForce 6       (NV4x)
[    81.558]     GeForce 7       (G7x)
[    81.558]     GeForce 8       (G8x)
[    81.558]     GeForce GTX 200 (NVA0)
[    81.558]     GeForce GTX 400 (NVC0)
[    81.558] (WW) Falling back to old probe method for s3
[    81.558] (WW) Falling back to old probe method for neomagic
[    81.558] (WW) Falling back to old probe method for apm
[    81.558] (WW) Falling back to old probe method for voodoo
[    81.558] (WW) Falling back to old probe method for sis
[    81.558] (WW) Falling back to old probe method for siliconmotion
[    81.558] (WW) Falling back to old probe method for trident
[    81.558] (WW) Falling back to old probe method for ark
[    81.558] (II) FBDEV: driver for framebuffer: fbdev
[    81.559] (II) VESA: driver for VESA chipsets: vesa
[    81.564] (++) Using config file: "/root/xorg.conf.new"
[    81.564] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    81.564] (==) ServerLayout "X.org Configured"
[    81.564] (**) |-->Screen "Screen0" (0)
[    81.564] (**) |   |-->Monitor "Monitor0"
[    81.565] (**) |   |-->Device "Card0"
[    81.565] (**) |-->Screen "Screen1" (1)
[    81.565] (**) |   |-->Monitor "Monitor1"
[    81.565] (**) |   |-->Device "Card1"
[    81.565] (**) |-->Screen "Screen2" (2)
[    81.565] (**) |   |-->Monitor "Monitor2"
[    81.565] (**) |   |-->Device "Card2"
[    81.565] (**) |-->Input Device "Mouse0"
[    81.565] (**) |-->Input Device "Keyboard0"
[    81.565] (==) Automatically adding devices
[    81.565] (==) Automatically enabling devices
[    81.565] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[    81.565]     Entry deleted from font path.
[    81.565] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[    81.565]     Entry deleted from font path.
[    81.565] (**) FontPath set to:
    /usr/share/fonts/X11/misc,
    /usr/share/fonts/X11/100dpi/:unscaled,
    /usr/share/fonts/X11/75dpi/:unscaled,
    /usr/share/fonts/X11/Type1,
    /usr/share/fonts/X11/100dpi,
    /usr/share/fonts/X11/75dpi,
    /var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType,
    built-ins,
    /usr/share/fonts/X11/misc,
    /usr/share/fonts/X11/100dpi/:unscaled,
    /usr/share/fonts/X11/75dpi/:unscaled,
    /usr/share/fonts/X11/Type1,
    /usr/share/fonts/X11/100dpi,
    /usr/share/fonts/X11/75dpi,
    /var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType,
    built-ins
[    81.565] (**) ModulePath set to "/usr/lib/xorg/modules"
[    81.565] (WW) Hotplugging is on, devices using drivers 'kbd', 'mouse' or 'vmmouse' will be disabled.
[    81.565] (WW) Disabling Mouse0
[    81.565] (WW) Disabling Keyboard0
[    81.565] (EE) [drm] No DRICreatePCIBusID symbol
[    81.565] (II) Loading sub module "fbdevhw"
[    81.565] (II) LoadModule: "fbdevhw"
[    81.565] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[    81.581] (II) Module fbdevhw: vendor="X.Org Foundation"
[    81.581]     compiled for 1.11.3, module version = 0.0.2
[    81.581]     ABI class: X.Org Video Driver, version 11.0
[    81.581] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[    81.581] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[    81.581] (EE) open /dev/fb0: No such file or directory
[    81.581] (WW) Falling back to old probe method for fbdev
[    81.581] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[    81.581] Number of created screens does not match number of detected devices.
  Configuration failed.

desinstallé pilotes nvidia c'est toujours pareil
ce qui est enervant c'est que meme le mode vesa ne fonctionne pas au minimun

Si vous avez eu le problème ou avez solution je suis preneur