What the tools can establish
| Result | Meaning |
|---|---|
| Topology class | The source/display behavior maps to a direct link, switch, splitter, matrix, or multiviewer. |
| Capacity requirement | Entered sources, display zones, audio-only outputs, and spare ports fit a minimum input × output count. |
| Declared mode fit | The selected EDID policy and declared scaler behavior are consistent with the entered maximum modes. |
| Audio route requirement | The connector and transport class required by the requested audio route is identified. |
| Implicated layer | Controlled observations narrow the next test; they do not identify a defective chipset or cable. |
What remains product-specific
Exact EDID tables, scaler behavior, supported timings, chroma and bit-depth conversion, HDR and VRR pass-through, CEC routing, ARC/eARC port assignment, audio codec handling, HDCP authentication, extender limits, switching time, firmware behavior, and cable performance must be verified for the exact model and installation.
Primary and public sources
- HDMI Licensing Administrator — Ultra HDMI cablesOfficial cable names, bandwidth classes, certification labels, backward compatibility, and the explicit absence of a universal cable-length value.
- HDMI Licensing Administrator — Enhanced Audio Return ChanneleARC purpose, supported high-bitrate audio classes, and cable guidance.
- Dolby Professional Support — endpoint device testingPublic topology guidance for sources, TVs, receivers, EDID capability changes, audio formats, and A/V sync considerations.
- Extron — EDID ManagerEvidence that EDID is managed across HDMI, DisplayPort, DVI, and VGA paths; cited as a concept and competition boundary, not a product recommendation.
- Pulse-Eight — matrix no-signal troubleshootingPublic one-zone versus all-zone fault scope and direct cable/path checks.
Conservative rules used here
- Lowest-common-mode is the safe shared-mode assumption when no per-output processing is declared.
- Copied or fixed EDID can advertise a mode a weaker display cannot accept.
- “Downscaler” proves only the exact conversions named by the manufacturer.
- eARC transport capacity does not prove that every connected device passes or decodes a requested codec.
- No result offers HDCP bypass, stripping, or circumvention guidance.
- Unknown stays unknown; a version number or HDMI connector does not imply every optional feature.
Last reviewed: August 26, 2026.