Ah!  A suspend to RAM and resume fixed it.  (Docked, but that may not
have been necessary.)  It looks like some stale state somewhere
associated with suspending.  It is possible that my laptop powered down
while in the suspended state just before the problem appearing (I'm not
certain).

Any idea where could that stale state be?  Which scripts to look at,
when this happens again etc.?

Otherwise, I seem to have a workaround, and things are back to normal,
so you can close this if you want.

Thanks anyway.

BTW, this was on a Dell Precision M4500 with an Nvidia Quadro FX 880M.

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Title:
  blank external monitor, with no cursor, after login

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