Microsoft has announced the rollout of the April Xbox update. It's a major update that brings along several changes - let's discuss them one by one. To begin with, the update brings a new Auto Low-Latency Mode (ALLM), which basically enables Xbox One devices to notify your display while gaming. This way, a TV that also supports ALLM will know to switch to its low latency video mode, or "game mode" as it's also known. Then comes support for variable refresh rate output to AMD's Freesync compatible displays. For those who aren't aware, Freesync helps reduce input latency and minimize...
Source: https://www.gsmarena.com/xbox_april_update_brings_support_for_1440p_resolution_auto_lowlatency_mode_and_freesync-news-30704.php