Cables and connections
ALLM (Auto Low Latency Mode)
An HDMI signal that tells a display to switch into its low-lag game mode automatically when a console or PC starts sending game content.
ALLM is a flag in the HDMI stream. When a source such as a console sets it, the display and any receiver in between disable picture processing and enter game mode; when the flag clears, for example when the console plays a film, they return to normal.
Without ALLM you must remember to change picture modes, and a receiver with video processing enabled can quietly add tens of milliseconds. With it, the chain stays low-lag for games and full-quality for movies.
Game modes typically bring input lag from 80 to 100 ms down to 10 to 20 ms. ALLM belongs to the HDMI 2.1 feature set but works over HDMI 2.0 bandwidth. It must be enabled on TV, receiver, and source to work end to end.
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