drm/i915: Disable high-bpc on pre-1.4 EDID screens
Prevents black screens when using 30bpp framebuffers on my HDMI screens here. The DP input on the same screen though reports a 1.4 EDID with the correct 8bpc limit set. v2: Actually check for the right thing! Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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