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read_write_edid/readme.md
2023-07-31 18:44:35 +02:00

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Read and Write EDID
===================
Read and write EDID data over an I2C bus.
Usage
-----
Load the Linux kernel module:
modprobe i2c-dev
Adapt the I2C bus device `/dev/i2c-4` in the examples below
to whatever matches your hardware setup.
**Note:** Be very careful to write to the correct bus!
Failing to do so may seriously damage your hardware!
To read an EDID, run (as root):
./edidread -d /dev/i2c-4 > edid.bin
To write an EDID, run (as root):
./edidwrite -d /dev/i2c-4 < edid.bin
**Note:** The `edidread` tool writes binary data to stdout which
is potentially dangerous. Redirect the output into a file or pipe.
For further usage information, run the comands with `--help`.
Notes
-----
Validate the EDID binary blob with the `edid-decode` tool:
edid-decode -c < edid.bin
Links
-----
* https://git.linuxtv.org/edid-decode.git/about/