I am having a similar problem...
but my monitor is a Samsung Samtron 56V
my ddcprobe gives correct output, so does sudo xresprobe vesa:

id: SAMTRON
res: 1152x864 1024x768 800x600 640x480
freq: 30-55 50-120
disptype: 

But xrandr gives wrong output!

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Incorrect resolution in usplash.conf (no output)
https://bugs.launchpad.net/bugs/127414
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