drm/i915: Only apply DPMS to the encoder if enabled
drm/i915: Only apply DPMS to the encoder if enabled

From Chris Wilson
aee8722c71db885fd3a617a9866f63b7165d93e0 in ubuntu 3.8
c9976dcf55c8aaa7037427b239f15e5acfc01a3a in mainline linux

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars