OK. I've now found out this topic is a hornets nest - anyone who is
interested should take a look at
http://bugs.freedesktop.org/show_bug.cgi?id=23705

I can't override the DPI in xorg.conf because it is ignored. I tried
xrandr --dpi, but it didn't make any difference on the VGA system when I
switched between 96 and 100, so the black left margin is still there.
Not surprisingly, changing dpi with xranr on the DVI interface made no
difference either.

** Bug watch added: freedesktop.org Bugzilla #23705
   http://bugs.freedesktop.org/show_bug.cgi?id=23705

-- 
Invalid EDID for Dell SP2309W in VGA mode
https://bugs.launchpad.net/bugs/563774
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