*** This bug is a duplicate of bug 49827 ***
    https://bugs.launchpad.net/bugs/49827

I think the problem are the default sync values in xorg.conf:
        HorizSync       28-51
        VertRefresh     43-60

Therefor the autodetection for the correct resolution fails with:
(--) NV(0): Panel size is 1920 x 1200
(II) NV(0): Using hsync ranges from config file
(II) NV(0): Using vrefresh ranges from config file
...
(II) NV(0): Not using default mode "1920x1200" (hsync out of range)

And if you enter specific mode lines (or probably adjust HorizSync
value) it somehow gets forced.

So, who is adding those default values and can they get bumped/removed.

** This bug has been marked a duplicate of bug 49827
   Available resolutions incompletely set to 1024x768, 800x600, 640x480

-- 
X.org doesn't detect widescreen resolution
https://bugs.launchpad.net/bugs/63551
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