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ERROR_GRAPHICS_DDCCI_INVALID_DATA
The transport completed, but the reply semantics were invalid
ERROR_GRAPHICS_DDCCI_INVALID_DATA is a validation failure after data arrived from the monitor. The packet may have a structurally valid command and checksum yet contain impossible field values, inconsistent feature data, or a payload that does not match the request. It should not be collapsed into a generic cable or I²C error.
Preserve the raw reply bytes before converting them into a high-level brightness, color, or timing value. Compare the response opcode and VCP code with the request, then validate feature-specific ranges and the MCCS version used for interpretation. If the same bytes are reproducible, the monitor firmware or an incompatible command is more likely than random transmission corruption.
Data needed to reproduce the validation failure
- Complete request and reply packets in hexadecimal.
- Expected response type and feature-code interpretation.
- Monitor model, firmware, capabilities string, and MCCS version.
- Whether checksum and declared message length were valid.
References
- Microsoft: low-level DDC/CI monitor operations
- ddcutil: interpreting VCP replies by MCCS version
- VESA: Monitor Control Command Set references
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