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[Why] Some monitors could suffer symbol unlock but cannot send HPD IRQ to notic source device to handle link loss. This makes monitor stuck in abnormal status and causes black screen. [How] According to the suggestion from scalar vendor, to check lane status again after link training done. That can improve the comaptibility from current production monitors. Signed-off-by: Martin Tsai <[email protected]> Reviewed-by: Aric Cyr <[email protected]> Acked-by: Eryk Brol <[email protected]> Signed-off-by: Alex Deucher <[email protected]>