I have the same problem. The screen just gone black after gdm. but if I press 
ctrl + alt + f1 then press ctrl + alt + f7, i can get the screen to work 
properly...
After I added (Option "UseDisplayDevice" "DFP") in xorg.conf, it still didn't 
work...
Anyone knows how to fix it?

it's Nvidia GeForce 7150M
Driver version: the newest 180.08

I install the dirver because i saw that it fixed the problem " Fixed a 
regression that could result in window decoration corruption when running 
Compiz using Geforce 6 and 7 series GPUs."
and it did, but i got a bigger problem ....


Here's my Xorg.conf:

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

Section "Files"
EndSection

Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

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

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
    #Option "UseDisplayDevice" "DFP"
EndSection

thanks,
Francis

-- 
[nvidia-glx] Using nvidia-glx driver, X is blank after install or upgrade 
(laptop/Geforce Go) without option "UseDisplayDevice" "DFP"
https://bugs.launchpad.net/bugs/82312
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