https://bugzilla.kernel.org/show_bug.cgi?id=60710
--- Comment #6 from Chris Rankin rankincj@yahoo.com --- (In reply to Alex Deucher from comment #5)
Well a warm reboot may not have fuly reset the hardware; the bad state may have persisted.
What "warm reboot"? IIRC, I powered the laptop down and came back to it ~6 hours later (although admittedly, I didn't remote the battery). The DVI-0 monitor came back fine afterwards, until I actually logged in and (presumably) GNOME3 tried to apply my account's XRandR settings.