EDID — What It Is and How to Manage It

Modified on Tue, 9 Jun at 9:43 PM

EDID (Extended Display Identification Data) is the mechanism by which a display tells a source device what video and audio formats it supports. Getting EDID right is the most common requirement during commissioning — a misconfigured EDID is the most frequent cause of sources outputting the wrong resolution, no picture at a zone, or audio not passing through correctly.

How EDID Works in a Neo Matrix System

Without a matrix, the EDID flow is simple: the display tells the source what it supports, the source outputs accordingly. With a matrix in the chain, this changes. The matrix sits between source and display and manages EDID in both directions:

•Input side: The matrix presents an EDID profile to the source. The source reads this and decides what resolution and audio format to output. By default the matrix presents a standard 4K profile.

•Output side: The matrix reads the EDID from the display at each zone and uses this to understand what that display can accept.

Because multiple displays may be connected to the same source via the matrix — and not all displays are identical — the matrix's input EDID profile needs to represent the lowest common denominator, or the highest-quality format that every display in the system can accept.

Pulse-Eight Neo Matrices do not downscale video. If a source outputs 4K and a display only supports 1080p, that display will show no picture. The matrix will not convert 4K to 1080p for you. Set the EDID profile on the input to match what all your displays can accept.

Viewing EDID in the Web Interface

Go to the Video Routing tab in the admin area of the web interface (gotomymatrix.com → Admin). Each input row has a source icon on the right — click it to view the EDID being presented to that source and the current video signal being received from it. Each output row has a monitor icon — click it to view what the connected display has reported it supports, and the signal currently being sent to that zone.

Key information on the input EDID panel

•EDID Profile — the profile the matrix is presenting to the source (e.g. Ultra HD 4K). This can be changed per input.

•Current video signal — the resolution the source is actually outputting. If this does not match what you expected, the source may be ignoring the EDID or the EDID profile may need adjusting.

•EDID Details — the full breakdown including supported colour formats, HDR modes, resolutions, and audio codecs. Use this to diagnose resolution or audio mismatches.

Key information on the output EDID panel

•Cable length estimate — the matrix measures the HDBaseT run length. If this is close to the matrix's maximum for the resolution being sent, it is a risk factor for signal quality.

•Current video signal — what the matrix is sending to that zone.

•EDID Details — the display's reported capabilities. Check this if you suspect the display cannot handle the incoming signal.

Changing the Input EDID Profile

In the input EDID panel, click the EDID Profile dropdown to select a different profile for that input. Common reasons to change it:

•Source outputting 4K but some displays are 1080p only — set the input EDID to a 1080p profile so the source outputs 1080p instead. All zones will then receive 1080p.

•Source ignoring the EDID and forcing 4K regardless — some streaming devices (Apple TV, Nvidia Shield) override EDID. Change the output resolution in the source device's own settings instead.

•No audio at the zone — check the audio codec section in the input EDID details. If the source only sees PCM stereo in the EDID profile, it will not send Dolby or DTS. Change the EDID profile to one that advertises surround audio capability.

•Long HDBaseT runs causing signal issues at 4K — dropping the input EDID to 1080p reduces bandwidth requirements, which can stabilise a marginal cable run.

Changing an EDID Profile is a request to the source device We are unable to scale the video signal received from the input device. On some occasions a device may continue to output an EDID beyond what we request. It is always best practice to go into settings on all your source devices and select the relevant format in addition to setting the EDID profile.

Performing an EDID handshake

After adding new equipment or changing EDID settings, the source device needs to re-read the EDID from the matrix. Sometimes this happens automatically when the source detects a signal change; sometimes it requires a manual re-handshake. If the source is still outputting the wrong resolution after changing the EDID profile, follow this sequence:

Power off the matrix and all source devices.

Power on all displays and confirm they are not in standby mode.

Wait 45 seconds.

Power on the matrix. Wait for the three green front panel LEDs.

Wait 45 seconds.

Power on all source devices. The sources will read the fresh EDID from the matrix on boot.

Common EDID Problems and Fixes

Symptom	Likely cause	Fix
Source outputs 4K but one zone shows no picture	That display doesn't support 4K	Set input EDID to 1080p, or check and correct the display's own input settings
Source ignores EDID and outputs 4K regardless	Source device overriding EDID (common on Apple TV, Nvidia Shield)	Change output resolution in the source device's own settings
No audio passthrough	Input EDID profile not advertising surround audio	Select an EDID profile that includes Dolby/DTS audio capability
Picture fine but wrong aspect ratio	Source outputting a resolution the display is scaling incorrectly	Match input EDID to the display's native resolution
HDR not working	Input EDID profile not advertising HDR support, or matrix model doesn't support that HDR format	Check EDID profile includes HDR; confirm matrix spec supports the HDR format
Resolution changed after adding a new display to a zone	Source re-read EDID and changed output	Perform full EDID re-handshake sequence above

Neo Matrices do not downscale. If a source outputs a resolution a display cannot handle, that display will show no picture. The matrix will not convert the signal. Always set the input EDID to the highest resolution all displays in the system can accept.

Need help with an EDID issue? Have the matrix model, firmware version, source device, and a description of the symptom ready.
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