NTSTATUS 0xC01E0321: meaning and diagnosis

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Description:

The monitor source mode set is invalid for the current VidPN operation.

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STATUS_GRAPHICS_STALE_MODESET	STATUS_GRAPHICS_INVALID_MONITOR_SOURCE_MODE

STATUS_GRAPHICS_INVALID_MONITOR_SOURCEMODESET

The mode-set container is invalid, not merely one mode

STATUS_GRAPHICS_INVALID_MONITOR_SOURCEMODESET applies to the VidPN object that contains monitor source modes for a target. A monitor source mode set is separate from the adapter source mode set and target mode set; it represents signal formats supported by the external display connected to that target.

Diagnose object provenance and lifetime first. A set can be stale after a topology change, associated with the wrong target, or obtained from an incompatible operation. Reusing a handle or structure from an earlier VidPN can produce this status even when the individual modes would otherwise be valid.

What to check

Log the VidPN handle, target ID, current topology generation, acquisition call, and release point.
Acquire a fresh monitor source mode set for the current target rather than editing a retained one.
Separate an invalid set from an invalid mode within a valid set and from an empty intersection with adapter capabilities.

References

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