I finally found a way to get the correct screen resolution on the
output. In the nvidia-settings utility there is a section called DFP-0
where there is a "Flat Panel Scaling" box. In that box I disabled "Force
Full GPU Scaling"

The "Flat Panel Information" claims the native resolution of my
projector is 1280x800 (which is incorrect). So something autodetects the
resolution as 1280x800 and set the GPU to do the scaling such that the
projector doesn't have to do it.

This should help narrow down the location of the bug. But disabling
"Force Full GPU Scaling" is a suitable workaround. Now I just need to
figure out how to make the change permanent.

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https://bugs.launchpad.net/bugs/959343

Title:
  Incorrect screen resolution

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