Comment 15 for bug 91292

This also sounds much like bug 3731, which many people have reported. I don't know if it's driver-specific, but the problem can be traced down to xresprobe, which is not reporting the resolutions correctly.

Also, xresprobe is not installed by default on Feisty, so I wonder if people who upgrade from Edgy->Feisty might be losing xresprobe, and then when x reconfigures it misses the refresh rates? Or else perhaps xresprobe is unable to interpret the EDID data from these nvidia cards?