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[Bryce Harrington <711954@xxxxxxxxxxxxxxxxxx>]

[   328.760] (II) intel(0): Modeline "1680x1050"x60.0  146.25  1680 1784
1960 2240  1050 1053 1059 1089 -hsync +vsync (65.3 kHz)

Likely a bug in the kernel's kms code, probably hardware-specific, but
I'll leave against -intel and see if I can give you a hand narrowing
this down a bit.  What was the last version of natty that worked?  Can
you try booting the .37 kernel and see whether it reproduces with that?

Once you can identify a working version of the kernel, then you can git
bisect down to the patch that caused the problem, and we can go from
there.

My guess is that something changed in how the modeline is generated for
that monitor by the kernel (or maybe monitors in general, but your
monitor is hit due to being an edge case).

If you're looking for workarounds, you might try nomodeset to turn off
the kernel's resolution magic, and see if X can do it better on its own.

** Package changed: xorg-server (Ubuntu) => xserver-xorg-video-intel
(Ubuntu)

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https://bugs.launchpad.net/bugs/711954

Title:
  Cannot use external monitor at its native resolution