What Is ALLM (Auto Low Latency Mode)?

ALLM (Auto Low Latency Mode) is a feature that automatically switches a TV to Game Mode when it detects a gaming signal. The TV recognizes that a console or PC is sending game content rather than a movie or streaming app, and it switches without any input from the viewer.

The feature is part of the HDMI 2.1 specification, but it isn't limited to HDMI 2.1 hardware. Many TVs and consoles support ALLM over standard HDMI 2.0 connections because the underlying signaling requirements are simple.

How ALLM Works

The process starts with signal detection. When a console or PC sends a game signal over HDMI, it includes a flag that tells the TV, "This is gaming content."

The TV reads that flag and switches its internal settings to Game Mode. Game Mode disables most of the picture processing the TV normally applies, including motion smoothing, edge sharpening, and color enhancement.

The full sequence looks like this:

1. The console or PC sends an HDMI signal flagged as gaming content.
2. The TV reads that flag and switches to Game Mode.
3. Motion smoothing, edge sharpening, and color enhancement turn off.
4. The TV reverts to its standard picture settings once the flag disappears.

Once the console switches back to a menu, app, or movie, the TV detects the change and reverts to its standard picture settings. The whole process happens in the background, and the viewer never has to open a settings menu.

Switching between picture modes takes a brief moment, since the HDMI connection has to renegotiate its signal. On some TVs this shows up as a short black screen or flicker lasting a second or two, most noticeable right when a game launches or closes.

Why Input Lag Matters for Gaming

Input lag is the delay between a button press and the moment that action appears on screen. Every stage of picture processing on a modern TV adds a small amount of this delay.

On a TV running full-picture processing, input lag commonly falls in the 40-80ms range or higher, depending on the model and settings. High-end TVs with a dedicated Game Mode can bring that number down to 10ms or less.

The difference matters most in fast-paced games. A shooter or fighting game where reaction time decides the outcome will feel noticeably less responsive with extra lag, while a turn-based strategy game is far more forgiving.

ALLM vs Manual Game Mode

Before ALLM, gamers had to manually open the TV's picture settings and switch to Game Mode before starting a session, then switch back afterward to restore full picture quality for movies and shows.

Skipping that second step was common, leaving the TV running in Game Mode during regular viewing, with picture processing disabled and no benefit to justify it.

ALLM removes both manual steps. The TV switches automatically based on the type of content coming through the HDMI connection, distinguishing between playing a game and watching a movie or show, even on the same device.

ALLM, VRR, and HDMI 2.1: How They Relate

ALLM and VRR (Variable Refresh Rate) are separate features that often get mentioned together because both improve the gaming experience and both appear in the HDMI 2.1 spec.

VRR matches the TV's refresh rate to the frame rate the console outputs, reducing screen tearing and stuttering. ALLM handles a different job: switching the picture mode to cut input lag.

A TV can support ALLM without supporting VRR, and vice versa. Full 4K@120Hz gaming does require HDMI 2.1, but ALLM alone works over older HDMI versions as well.

How to Check If Your TV and Console Support ALLM

To confirm ALLM is active:

1. Launch a game and watch for an on-screen "Game Mode" notification or icon.
2. Open the TV's picture or HDMI settings and confirm ALLM (or its brand-specific name) is enabled.
3. If nothing changes, check the console's HDMI output settings.
4. If the picture flickers or the signal drops, disable ALLM or VRR one at a time to isolate the cause.

Most current TVs display a small on-screen notification, often labeled "Game Mode" or an icon in the corner, the moment ALLM activates. That notification is the simplest way to confirm the feature is working.

The setting itself is usually listed under the TV's picture or HDMI settings menu, sometimes labeled "Auto Game Mode" or "Instant Game Response" depending on the brand. Confirm it's enabled if the automatic switch isn't happening.

On the console side, ALLM support is tied to the console's system settings for HDMI output rather than something a player needs to configure separately. If the TV shows no change when a game launches, the issue is usually on the TV's end rather than the console's.

If the screen flickers, drops the signal, or goes briefly black every time a game launches, that's usually the ALLM/VRR handshake at work rather than a fault. Turning off VRR or ALLM individually in the TV's settings, one at a time, isolates which one is causing it.