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ERROR_GRAPHICS_DDCCI_INVALID_MESSAGE_COMMAND
The command field identifies the packet operation
ERROR_GRAPHICS_DDCCI_INVALID_MESSAGE_COMMAND means a packet reached the host with an unexpected or invalid DDC/CI command value. The response might belong to another request, be shifted because of framing damage, or come from firmware that emitted a vendor command where a standard reply was required.
Log the transmitted opcode and the command byte returned by the monitor. Serialize access to the same physical monitor so that concurrent callers cannot consume each other's replies. If the length and checksum are valid but the command remains wrong, focus on request/reply pairing and monitor firmware rather than retrying at the I²C address level.
Packet-correlation evidence
- Outgoing command and expected reply opcode.
- Returned command byte and source monitor handle.
- Concurrent monitor-control operations on the same connector.
- Checksum, length, and VCP code from the same packet.
References
- Microsoft: sequence for low-level monitor commands
- ddcutil: DDC/CI packet exchange over I²C
- VESA: DDC/CI protocol standard
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