I am having this same issue. Dell Precision 670 with a DELL3007WFPH
Monitor

# ddcprobe
vbe: VESA 3.0 detected.
oem: NVIDIA
vendor: NVIDIA Corporation
product: NV35 Board - q268-0 Chip Rev
memory: 131072kb
mode: 640x400x256
mode: 640x480x256
mode: 800x600x16
mode: 800x600x256
mode: 1024x768x16
mode: 1024x768x256
mode: 320x200x64k
mode: 320x200x16m
mode: 640x480x64k
mode: 640x480x16m
mode: 800x600x64k
mode: 800x600x16m
mode: 1024x768x64k
mode: 1024x768x16m
edid: 
edid: 1 3
id: 4016
eisa: DEL4016
serial: 4756395a
manufacture: 27 2008
input: analog signal.
screensize: 64 40
gamma: 2.200000
dpms: RGB, active off, no suspend, no standby
dtiming: 1280x...@59
dtiming: 2560x1...@59
monitorname: DELL3007WFPH
monitorserial: G744H871GV9Z

# get-edid | read-edid
get-edid: get-edid version 2.0.0

        Performing real mode VBE call
        Interrupt 0x10 ax=0x4f00 bx=0x0 cx=0x0
        Function supported
        Call successful

        VBE version 300
        VBE string at 0x11100 "NVIDIA"

VBE/DDC service about to be called
        Report DDC capabilities

        Performing real mode VBE call
        Interrupt 0x10 ax=0x4f15 bx=0x0 cx=0x0
        Function supported
        Call successful

        Monitor and video card combination does not support DDC1 transfers
        Monitor and video card combination supports DDC2 transfers
        0 seconds per 128 byte EDID block transfer
        Screen is not blanked during DDC transfer

Reading next EDID block

VBE/DDC service about to be called
        Read EDID

        Performing real mode VBE call
        Interrupt 0x10 ax=0x4f15 bx=0x1 cx=0x0
        Function supported
        Call failed

The EDID data should not be trusted as the VBE call failed
EDID claims 255 more blocks left
EDID blocks left is wrong.
Your EDID is probably invalid.
read-edid: command not found



** Attachment added: "All Xorg log files"
   http://launchpadlibrarian.net/36854172/Xorg.tgz

** Changed in: linux-restricted-modules-2.6.22 (Ubuntu)
       Status: Invalid => New

-- 
NVidia driver doesn't work with 3007WFP
https://bugs.launchpad.net/bugs/185149
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