https://bugs.freedesktop.org/show_bug.cgi?id=76483

--- Comment #21 from Karl Schendel <schendel-zf86OBlHRo2+XT7JhA+gdA@public.gmane.org> ---
That change alas produces a garbled display at startup.  (It's wrapped in both
directions and jittery, like an old TV with bad sync pulse detection.)

Just for the heck of it, I tried removing the -1 (dcb->heads is 2) and the
display is fine but then it's back to DPMS on not working after off.

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