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STATUS_GRAPHICS_TARGET_ALREADY_IN_SET
A target set cannot contain the same target twice
The target ID can be valid for the adapter, but the current target set already includes it. WDDM topology code distinguishes a unique set of targets from the list of present paths, and a mirror, clone, or retry path can accidentally insert the same target again.
This is a data-structure error around set construction, not a sign that the monitor is connected twice. The right investigation is the caller that builds the set and the rule used to merge paths, especially after topology augmentation or user-mode display configuration changes.
What to check
- Compare the target set with the VidPN path list; they are related but not interchangeable.
- Deduplicate by target ID before calling the VidPN interface.
- Check rollback and retry paths for double insertion after a previous call succeeded.
References
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