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ERROR_GRAPHICS_MCA_INVALID_CAPABILITIES_STRING
The capabilities string is a structured monitor declaration
ERROR_GRAPHICS_MCA_INVALID_CAPABILITIES_STRING means the text returned by the monitor does not follow the expected parenthesized DDC/CI capabilities grammar. The string can declare protocol type, model, supported commands, VCP codes with legal values, and an mccs_ver token; malformed nesting or token syntax prevents trustworthy feature discovery.
Retain the unmodified string and the exact byte length, including its terminator. Determine whether retrieval itself was truncated before blaming the parser. A monitor may still answer individual VCP requests despite a bad capabilities declaration, but software should not invent support from an unparseable list. Compare the raw value with a known-good unit of the same firmware revision.
Capabilities-string validation points
- Balanced parentheses and complete top-level capability groups.
- Declared buffer length versus bytes actually returned.
- Raw
vcpandmccs_vertokens. - Differences between monitor firmware revisions or input ports.
References
- Microsoft: retrieving the monitor capabilities string
- ddcutil: raw and parsed capabilities output
- VESA: DDC/CI and MCCS specifications
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