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If an HDMI/DP display is detected, probe the sibling port that shares physical pins too and bail out if something is detected. This is a precaution for adapters that expose the pins of a port for both HDMI/ DVI and DP (like some ThinkPad docks). A user might have attached both by accident and there are rumors of displays that got fried by apply- ing the wrong signal. Change-Id: I276ad55a353d60389bc36724d8af37b158ae4599 Signed-off-by: Nico Huber <nico.h@gmx.de> Reviewed-on: https://review.coreboot.org/17755 Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>