My suspicion here is that the LVDS doesn't have its preferred mode set
properly, and so gdm is randomly picking 1280x1024 from that. But
that's just a guess. Most likely this requires a quirk.
The way to test this theory would be to add the following to your
xorg.conf:
Section "Monitor"
...
Option "PreferredMode" "1680x1050"
EndSection
If that makes everything work properly for you, then I'll look into
getting a quirk added for it.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Incomplete => Confirmed
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[Hardy] GNOME and GDM are starting up with wrong display resolution
https://bugs.launchpad.net/bugs/190506
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