I hope this is your questions..
this works:
Section "Monitor"
Identifier "Dell"
Option "DPMS"
Option "UseEDID" "FALSE"
Option "UseEDIDFreqs" "FALSE"
Option "UseEDIDDpi" "FALSE"
Option "ModeValidation" "NoEdidModes"
HorizSync 30 - 85
VertRefresh 48 - 120
# DisplaySize 312 234
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[nvidia-glx] Nvidia does not load correct resolutions for monitor unless EDID
information is ignored
https://bugs.launchpad.net/bugs/111894
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Bugs, which is the bug contact for Ubuntu.
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