Under Oneric, where this is working, I did:
cat 
/sys/devices/pci0000:00/0000:00:02.0/0000:05:00.0/drm/card0/card0-DVI-I-1/edid 
> my_edid.bin

Then copied it to my Precise install in /etc/X11/my_edid.bin

In my Precise /etc/X11/xorg.conf screen section I added:
        Option "CustomEDID" "VGA-1:/etc/X11/my_edid.bin"

$ grep edid /var/log/Xorg.0.log
[    15.875] (**) NVIDIA(0): Option "CustomEDID" "VGA-1:/etc/X11/my_edid.bin"

It didn't help.  Still flickering, the Displays dialog still says
"Unknown".

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https://bugs.launchpad.net/bugs/958439

Title:
  Doesn't detect monitor / "Unknown", causes flickering / low refresh
  rate

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