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ERROR_GRAPHICS_I2C_ERROR_TRANSMITTING_DATA
The failure occurred on the write portion of the transaction
ERROR_GRAPHICS_I2C_ERROR_TRANSMITTING_DATA means communication progressed far enough to attempt transmission, then failed before a valid DDC/CI request reached the monitor. Possible causes include a NACK during the payload, bus arbitration or timeout problems, an adapter that mishandles combined transactions, or a monitor temporarily busy after an earlier command.
Capture the command type, byte count, retry interval, and connector state. A successful EDID read does not prove that DDC/CI writes work, because they may use a different address and transaction sequence. Avoid tight retry loops: Monitor Configuration calls can be slow, and some displays require a documented delay between request and reply.
Details that separate protocol and electrical faults
- DDC/CI opcode and VCP feature being transmitted.
- Number of bytes accepted before the transfer failed.
- Retry delay and whether a previous command was still processing.
- Behavior with a direct cable and without a KVM or dock.
References
- Linux kernel: I²C send and combined transactions
- Linux kernel: common I²C transfer fault meanings
- ddcutil: DDC/CI timing and retries
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