Thanks for looking into this, guys.  This is what I found:

- When I plug in the VGA cable and switch to VT1, the screen goes black,
even when I don't run `xrandr -q` first, so that doesn't give any
additional info.

- Running `xrandr -q --verbose > ~/xrandr.txt` (with cable plugged in)
without switching to VT1: system freezes, bottom part of the screen goes
black, on the upper part of the screen I see my scrambled wallpaper and
the (frozen) mouse pointer. No image on the external monitor. When I
reboot using sysrq-reisub xrandr.txt is empty

- Running udevadm monitor --property > ~/udevadm.log before opening the
monitors dialogue: system freezes, screen goes black, file is empty when
I reboot.

Let me know if there's anything else I can try.

-- 
[arrandale] VGA port not working on Dell Latitude E6510
https://bugs.launchpad.net/bugs/607783
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