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ERROR_GRAPHICS_MCA_INVALID_VCP_VERSION
VCP code DF is a structured version value, not an arbitrary number
ERROR_GRAPHICS_MCA_INVALID_VCP_VERSION occurs when the reply for VCP feature 0xDF cannot be interpreted as a valid MCCS version. Windows uses that value to decide how other feature codes and enumerated values should be understood, so an impossible major/minor pair undermines subsequent high-level monitor operations.
Capture the raw DF reply rather than only the formatted version string. Check whether the monitor marks the feature unsupported, returns swapped bytes, or exposes a vendor value outside the API's accepted range. Compare the result with the mccs_ver capability token; disagreement has its own more specific error and should not be diagnosed as a malformed version field.
Version evidence to compare
- Raw bytes returned for VCP feature 0xDF.
- Feature result code and continuous/non-continuous type.
- The
mccs_vertoken in the capabilities string. - Monitor model, firmware, and active signal input.
References
- Microsoft: obtaining VCP feature replies
- ddcutil: VCP Version feature and MCCS revisions
- ddcutil: overriding interpretation by MCCS version
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