To workaround this you can edit /etc/X11/xorg.conf file as following:

Section "Screen"
        Identifier      "Default Screen"
        Monitor         "Configured Monitor"
        Device          "Configured Video Device"
        SubSection "Display"
                Depth            16
                Modes           "1024x768" "800x600" "640x480"
                Virtual 1280 1024
        EndSubSection
EndSection

-- 
Display resolution is not stable
https://bugs.launchpad.net/bugs/425595
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which is subscribed to xserver-xorg-video-openchrome in ubuntu.

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