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:
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.