Control & connections
ALLM (Auto Low Latency Mode)
A flag from a console that tells the TV to switch to game mode automatically.
What is it?
ALLM is an HDMI 2.1-era feature (also on HDMI 2.0 TVs like Samsung Q9FN) signalled in the HF-VSIF infoframe: when a console or PC starts a game, the TV switches to its low-lag game picture mode by itself, and back to movie mode afterwards. VRR (variable refresh rate) is its sibling.
Why it matters with the HDfury Vertex²
The HDfury Vertex² detects ALLM (shown on the OLED RX line and OSD), passes it to the display, and since firmware 0.49 has an ALLM control section: force ALLM on or off, or follow the source, per input — useful when a TV goes into game mode for a media player that sets the flag incorrectly.
How to use it on the Vertex²
Web server → EDID → ALLM flag (advertise support to the source); web server → HDR/DV or CONFIG → ALLM control: Follow / Force ON / Force OFF per input. Custom EDID 4 (Q9FN ALLM VRR HDR10+) includes it.
Related terms
- Infoframes: AVI, VSIF, SPD, AUD, HVS, HFV — Small data packets sent with every frame that describe the picture, sound and source.
- Input lag (< 1 ms) — The delay a device adds to the picture — the Vertex² adds only a few pixel clocks.
- EDID — The 'ID card' a display sends to a source listing what it can do — the Vertex² lets you rewrite it.
- 4K120 4:2:0 and 8K30 4:2:0 — The highest resolutions/frame rates that fit through 18 Gbps — only with 4:2:0 8-bit colour.