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It only controls the setting of the vbt.edp_support variable, which in turn only controls one debug output plus can also force-disable the lvds output. Since the value only restricted this logic to mobile ilk there's the slight risk that this will break lvds on desktop ilk or on snb/ivb platforms. But with the vbt it's better when we know what's going on here, so let's rip it out and see what happens. Cc: Ben Widawsky <benjamin.widawsky@intel.com> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>