Comment # 21 on bug 76483 from Karl Schendel

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.