https://github.com/bulletmark/edid-rw

A utility to read and write a display EDID value.
https://github.com/bulletmark/edid-rw

Last synced: over 1 year ago
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A utility to read and write a display EDID value.

• Host: GitHub
• URL: https://github.com/bulletmark/edid-rw
• Owner: bulletmark
• Created: 2012-05-08T00:23:17.000Z (over 14 years ago)
• Default Branch: master
• Last Pushed: 2025-01-28T00:48:27.000Z (over 1 year ago)
• Last Synced: 2025-03-28T18:15:00.040Z (over 1 year ago)
• Language: Python
• Homepage:
• Size: 16.6 KB
• Stars: 174
• Watchers: 13
• Forks: 22
• Open Issues: 4
• Metadata Files:
  • Readme: README.md

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README

          
## edid-rw: A utility to read and write a display EDID value

_Sorry, but I do not support this project anymore. I wrote this utility

for my own one-off personal use many years ago but have no means to test

and support changes nowadays. Feel free to fork and improve it._

### Overview

This utility will read and/or write a display's EDID data structure. Use

it with the edid-decode utility to view and check an EDID.

You can also write new EDID data to attempt to fix a corrupt EDID.

*WARNING - THIS UTILITY CAN DESTROY YOUR DISPLAY, MOTHERBOARD, OR OTHER

CONNECTED HARDWARE IF RUN INCORRECTLY. Be very sure you understand what

you are doing. See [this issue](http://github.com/bulletmark/edid-rw/issues/5)

for an example of what can happen.*

You may have to disable output to the display before you can write the

EDID.

### Installation

Requires python3 smbus module, and edid-decode utility.

Install these prerequisites on Debian/Ubuntu:

    sudo apt-get install python3-smbus edid-decode

Or, install these prerequisites on Arch:

    yay -S i2c-tools edid-decode-git

Get this source code:

    git clone https://github.com/bulletmark/edid-rw

    cd edid-rw

This utility should run using Python version 3.2+. It does not work with

Python 2.

### Usage

Run with `-h` switch to see usage and optional arguments:

    ./edid-rw -h

Fetch and decode display address 0 EDID data:

    sudo ./edid-rw 0 | edid-decode

Fetch and decode display address 1 EDID data:

    sudo ./edid-rw 1 | edid-decode

Capture display address 0 EDID data, edit it, and write it back to

device. Use `!Gxxd [-r]` within vim to read, edit, and write binary

file. See `:h xxd` within vim help. You should set the checksum (last)

byte correctly although edit-rw will calculate and set the checksum

itself if you include the `-f (--fix)` switch. edid-rw will always

validate the checksum and will not write an invalid EDID:

*WARNING - Be sure to triple check the EDID address you are about to

write!*

    sudo ./edid-rw 0 >edid.bin

    vim -b edid.bin # Then use xxd within vim, see ":h xxd" in vim

    sudo ./edid-rw -w 0 .

### License

Copyright (C) 2012 Mark Blakeney. This program is distributed under the

terms of the GNU General Public License.

This program is free software: you can redistribute it and/or modify it

under the terms of the GNU General Public License as published by the

Free Software Foundation, either version 3 of the License, or any later

version.

This program is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

Public License at  for more details.