How to Force an EDID onto a Display Output

Last updated 27 July 2026

How to Force an EDID onto a Display Output

An EDID is the description a display gives the graphics card of what it can accept. Forcing one makes the server ignore what is actually plugged in and use a description you control instead. Use this when a projector advertises a mode you do not want, when a switcher or extender mangles the real EDID, or when an output must hold its resolution with nothing attached at all.

Requires the Administrator role. Non-administrators see the assignment table read-only and no editor.

[USER-ACTION-REQUIRED: Attach a screenshot of the EDID tab showing the override table, the editor, and the saved slots list here]

Before you start

  • You are signed in to System Management as an Administrator
  • The target output is on the Windows desktop and is not part of a Mosaic grid — EDID is locked in both of those states
  • You know the exact mode you want the output to present: resolution, refresh rate, bit depth, and connector type
  • A maintenance window — the affected outputs will resync, and the change is best verified with a reboot

Steps

1. Open the EDID tab

In the System Management sidebar, under Configure > GPU, select EDID. The page has three parts: the override table at the top, the EDID editor in the middle, and Saved EDID slots at the bottom.

2. Check which outputs can be changed

The table lists every output per graphics card, with its Current source — where its EDID comes from today, and the slot name if an override is already in force. An output that cannot be changed shows the reason instead of controls: in an active Mosaic, in a Mosaic that is removed from the desktop, or removed from the desktop on its own.

Locked outputs are not a bug. Changing an EDID underneath a Mosaic grid or a detached display fights the driver's own state. Clear the grid or return the display to the desktop first, set the EDID, then rebuild. This is why EDID comes before Mosaic in the commissioning order.

3. Build the EDID you want

In the EDID editor, choose one of three starting points:

  • Import from display — pick a source from the dropdown and read the EDID off a display that is currently attached. Best when you have one known-good projector and want every output to present the same thing.

  • Import from file (.bin) — load an EDID binary, for example one the display manufacturer supplied.

  • Create generic (generator) — build one from scratch by specifying the mode and capabilities. Use this when no physical display can supply what you need.

When you import from a display or a file, you then pick which Modes to keep, and can optionally override the base timing rate or inject an additional CTA or DisplayID timing. Trimming modes is useful: an EDID that only advertises the one mode you want cannot fall back to something else.

4. Preview and save it to a slot

Select Preview EDID (or Generate EDID in the generator) and read back the resulting modes before committing. Give it a Slot name and select Save to slot. Saved slots appear at the bottom of the page, where they can be downloaded as a .bin or deleted.

Names are limited to 13 characters — that is an EDID format limit, not a UI choice. Pick something that still identifies the EDID when you read it in the Current source column months later, such as the resolution and rate.

5. Assign the slot to the outputs

Back in the override table, choose the slot from the dropdown next to each output that should use it.

Applying to several outputs? Select the slot on all of them, then use Apply all — not Apply one at a time.

The graphics driver only treats a custom timing as verified when it is validated across every participating output together. Applying outputs one by one leaves each timing registered but unchecked, and the usual symptom is that only some of the outputs actually take the EDID. Apply all sends them as a single batch and avoids this.

For a single output, Apply on its row is fine.

6. Verify

The page reloads and the Current source column should now name your slot on every output you applied to. Check the resulting mode on Maintain > GPU Status — a forced EDID changes what the output demands, so confirm the link still carries it. Reboot once before handing the system over, to prove the override comes back.

7. Remove an override when you no longer want it

Select Clear override on a row to return that output to the attached display's own EDID, or Clear all override to do it for every output at once. Clearing an override does not delete the slot — it stays available to reassign later.

Generator options explained

These fields appear when you choose Create generic (generator).

Resolution and timing

Setting

Description

Values / Range

Width / Height

The resolution the EDID advertises as its preferred mode.

Pixels

Refresh (Hz)

Refresh rate of that mode. Fractional rates are accepted for broadcast-style timings.

Hz, three decimal places

Connector

Which connector type the EDID should describe itself for. This decides which extension blocks are written.

DVI · HDMI · DisplayPort

Timing

Blanking scheme. Reduced-blanking timings cut the pixel clock needed for a given mode, which matters on bandwidth-limited links.

Standard CVT · CVT-RB v1 (up to 4095 px) · CVT-RB v2 (above 4095 px)
Color

Setting

Description

Values / Range

Bit depth

Bits per component the EDID claims support for.

8 · 10 · 12

Format

Color encoding the EDID advertises.

RGB · YCbCr 4:4:4 · YCbCr 4:2:2 · YCbCr 4:2:0

Include secondary VICs

Also advertise common standard modes alongside the preferred one. Leave off when you want the output pinned to exactly one mode.

Checkbox — adds 4K@60, 4K@30, 1080p@60

Color spaces

Additional color spaces to declare. sRGB and BT.709 are always included.

BT.2020 YCC · BT.2020 RGB · DCI-P3 D65 · AdobeRGB / opRGB
DSC, audio and name

Setting

Description

Values / Range

Enable DSC

Declare Display Stream Compression support, for DisplayPort and HDMI. Only claim this if the display really supports it.

Checkbox

Bits/pixel

Target compressed bit rate advertised for DSC.

Number

Max slices

Maximum DSC slice count declared.

1 · 2 · 4 · 8 · 12 · 16

Enable audio

Declare an audio sink on HDMI or DisplayPort, with the channel count, sample rates, and sample sizes you tick.

Checkbox · 2, 6 or 8 channels

Monitor name

The name the output will report. This is what you will see in output lists later, so make it meaningful.

Text, 13 characters

Common Mistakes

  • Applying to outputs one at a time. The single most common cause of "it worked on some outputs but not others". Select the slot on every output, then use Apply all.

  • Trying to set an EDID on a Mosaic member. The row shows the reason and offers no controls. Clear the grid, set the EDID on each member, then rebuild the grid.

  • Declaring capabilities the display does not have. An EDID is a claim, not a capability. Advertising DSC, 12 bpc, or a mode the panel cannot accept produces a blank or unstable picture, and the fault will look like a cable problem.

  • Keeping every mode when importing from a display. If the point of the override was to stop the output falling back to another mode, trim the mode list down to the one you want.

  • Assuming the override persists on its own. Enable Restore Settings on Startup on the Options tab, then reboot once and confirm before leaving site.

Tips

  • Forcing an EDID is the standard fix for outputs that must keep running with no display attached — a projector that is powered down between shows, or a signal path through a switcher that drops out.

  • Build one slot and apply it to every output in a blended array. Identical EDIDs mean identical timings, which removes a whole class of sync and seam problems.

  • Download the slot as a .bin from the saved slots list and keep it with the project files. It is the fastest way to reproduce the setup on a replacement server.

  • Reduced-blanking timings lower the pixel clock for the same mode. If a link is marginal, CVT-RB can be the difference between a stable picture and an intermittent one.

  • Set the monitor name to something you will recognise. It becomes the display name on the Outputs, Desktop, and GPU Status tabs.

How to Set Output Color Format, Bit Depth and Range — set what the output actually sends, once the EDID decides what it can send.

How to Check GPU Output Signal Status — check the forced mode against the link's real bandwidth.

Display and GPU Configuration — the other GPU tabs and the order to work through them.