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ERROR_MCA_INVALID_TECHNOLOGY_TYPE_RETURNED
What Windows was trying to learn
This error is associated with retrieving the display technology type through the high-level monitor configuration API. The value is an enumeration used to describe technologies such as CRT, plasma, and LCD or TFT. It is not a panel model identifier, an EDID manufacturer code, or a generic graphics-adapter capability.
Check capability before querying technology
GetMonitorTechnologyType is meaningful only when GetMonitorCapabilities reports the MC_CAPS_DISPLAY_TECHNOLOGY_TYPE capability. If that capability flag is absent, the technology query should fail as unsupported. This error is different: Windows obtained a value, but the value was not valid for the MCCS technology enumeration.
Diagnostic evidence that matters
- Log the physical monitor handle and the capability flags returned for that handle.
- Record the returned enum value exactly; do not replace it with a guess based on marketing information or an EDID name.
- Confirm that the queried handle still refers to the intended monitor after docking, hot-plugging, display rotation, or topology changes.
- Compare the result with the monitor firmware version and vendor support material. A driver update can change the path used to reach the display, but it cannot make an invalid device reply conformant on its own.
Applications should use the technology type only for behavior that is explicitly documented as technology-dependent. For example, the Windows API notes that degaussing applies to CRT monitors; it is not a universal display operation.
References
- Microsoft: GetMonitorTechnologyType
- Microsoft: MC_DISPLAY_TECHNOLOGY_TYPE
- Microsoft: ERROR_MCA_INVALID_TECHNOLOGY_TYPE_RETURNED
- VESA DDC/CI Standard
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