I found a way to work around the issue:

$ xrandr --addmode VGA1 1280x1024
$ xrandr --output VGA1 --mode 1280x1024

but I have to do this after every reboot which is not a good solution. I also 
found out that EDID information is not detected correctly by the i915 drm 
modul, as
/sys/module/drm/drivers/pci:i915/0000:00:02.0/drm/card0/card0-VGA-1/edid is an 
empty file.

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https://bugs.launchpad.net/bugs/1049534

Title:
  [regression from 12.04] VGA Monitor uses reduced resolution

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