Revert "drm/i915: allow PCH PWM override on IVB"
This reverts commit f82cfb6b. This breaks the backlight controls on my IVB asus zenbook with an eDP panel. I guess the right fix would be to read this bit and use either the pch or the cpu register to frob the backlight values. But that is stuff for -next. Cc: Jesse Barnes <email@example.com> Signed-Off-by: Daniel Vetter <firstname.lastname@example.org>
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