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STATUS_GRAPHICS_DDCCI_INVALID_MESSAGE_COMMAND
STATUS_GRAPHICS_DDCCI_INVALID_MESSAGE_COMMAND is a protocol-field error. The command value in a DDC/CI message is invalid, so this is not the same as a monitor that recognizes a valid command but does not implement one requested VCP feature.
The right comparison is the complete DDC/CI transaction: message direction, command field, length, checksum, and selected monitor. Changing only a VCP code does not correct a malformed command envelope.
What to inspect
- Keep the command identifier and operation type in the diagnostic record.
- Check serialization at the API or transport boundary before interpreting the monitor response as a device capability problem.
- Differentiate command-field failure from invalid-data, length, and checksum results, which identify other reply or message defects.
References
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