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STATUS_GRAPHICS_DDCCI_INVALID_MESSAGE_LENGTH
STATUS_GRAPHICS_DDCCI_INVALID_MESSAGE_LENGTH identifies an invalid DDC/CI message length field. This is a framing error: the receiver cannot safely use the field to determine the message boundaries for the monitor-control transaction.
It should not be collapsed into a generic invalid-data report. A precise length-field result can indicate a serialization defect, a truncated response, or an unexpected payload shape at the DDC/CI boundary.
Safe diagnostic handling
- Record the advertised length and the actual byte count if the layer exposes both.
- Do not parse feature values from the same message after the length field has been rejected.
- Keep this separate from checksum failure: a checksum can only be meaningfully evaluated once message boundaries are defined.
References
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