Try add to file xorg.conf in:
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
SubSection "Display"
Virtual 1680 1050
EndSubSection
EndSection
--
[P4M900] openchrome detects bad resolution (720x400 instead of 1680x1050)
https://bugs.launchpad.net/bugs/378033
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which is subscribed to xserver-xorg-video-openchrome in ubuntu.
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