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bbfa235
(Get the code!)
I had perhaps a similar problem. AMD64 GeForce7300 working fine in Gutsy broke on upgrade to Hardy. Could only get 640x480 and 800x600 resolutions. Now, before I knew what was wrong I tried many many things, so perhaps several variables were in play here, but in the end the way I fixed it was commenting out the "Device" and "Monitor" sections from my /etc/X11/xorg.conf. They were just dummy sections anyway:
#Section "Device"
# Identifier "Configured Video Device"
#EndSection
#Section "Monitor"
# Identifier "Configured Monitor"
#EndSection
After I did this, it seems that Hardy looked for the EDID info, found everything fine and I was on my way. But for some reason, during the upgrade it may have added those sections (or they got added in my post-install flailing to fix the problem).