this is not exactly arandr's fault, but i think i can help anyway (an
explanation follows, if you just need to fix it go to the last
paragraphs):
when the x server starts, it figures out how large to make the
"Virtual", the theoretical maximum area. in arandr, the virtual is shown
as the dark gray area.
when your external monitor is not connected, the largest horizontal
extension of all the monitors the x server sees at startup is 1680 (your
laptop monitor's width), and it choses to make the virtual 1680x1680 in
case you want to rotate your monitor.
when the external monitor gets later connected, even though it announces
it resolutions correctly (as seen in the EDID_DATA block), the x server
only offers the resolutions that would fit in the existing virtual.
everything larger gets dropped, and 1600x1200 is the largest that fits.
when the external monitor is connected at startup, the x server sees the
need for the larger screen, and allocates the virtual appropriately.
as a workaround, you can give x an explicit virtual size to allocate.
depending on how you use your displays, this could be 1920x1200 (if you
only use either monitor), 3600x1200 (if you want them side by side), or
3600x3600 (if you want to use all possible combinations, including
rotated monitors) or even higher given you could connect even more
monitors. create an /etc/X11/xorg.conf with the following contents:
Section "Screen"
SubSection "Display"
Virtual 3600 1200
EndSubSection
EndSection
(you may or may not have to integrate that into an existing xorg.conf,
depending on your configuration)
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https://bugs.launchpad.net/bugs/941470
Title:
Resolution for external monitor missing in list for DFP1
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