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ERROR_GRAPHICS_MCA_MONITOR_VIOLATES_MCCS_SPECIFICATION
Advertised MCCS compliance creates concrete response rules
ERROR_GRAPHICS_MCA_MONITOR_VIOLATES_MCCS_SPECIFICATION is used when a reply conflicts with requirements of the MCCS version the monitor claims to implement. Examples include impossible feature types, reserved values, incoherent ranges, or command behavior that the declared revision does not permit.
Document the exact feature and rule being violated instead of reporting only that the display is incompatible. Preserve raw requests, replies, capabilities text, and the VCP Version result. A vendor utility may appear to work because it contains model-specific exceptions; that does not make the device standards-compliant. Application workarounds should be tightly scoped to verified models and firmware to avoid misinterpreting other monitors.
A useful conformance report contains
- Claimed MCCS version from both available version sources.
- Specific VCP code, request, and raw reply.
- Expected feature type or legal values for that revision.
- Monitor model, serial information, and firmware version.
References
- VESA: published MCCS standards
- ddcutil: feature definitions by MCCS revision
- ddcutil: raw and interpreted feature output
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