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ERROR_GRAPHICS_MCA_UNSUPPORTED_MCCS_VERSION
The API supports only the MCCS revisions it knows how to interpret
ERROR_GRAPHICS_MCA_UNSUPPORTED_MCCS_VERSION differs from an invalid or mismatched version. The monitor may report a syntactically valid revision, but the Windows high-level Monitor Configuration API does not implement that revision's feature semantics. Passing the response through older assumptions could misclassify VCP values or issue an unsafe write.
Record whether the version came from feature DF, the capabilities string, or both. Low-level DDC/CI tools may support additional revisions or expose raw values, but that does not make the high-level Windows call compatible. Prefer capability-driven handling and preserve unknown codes rather than coercing the display into a supported version number.
Compatibility decisions to document
- Exact major and minor MCCS revision reported.
- Windows API function that rejected the version.
- Whether low-level raw VCP access still succeeds.
- Features required by the application and their revision-specific definitions.
References
- Microsoft: high-level and low-level monitor configuration
- ddcutil: MCCS revision history and feature types
- VESA: available MCCS specification revisions
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