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ERROR_GRAPHICS_MONITORDESCRIPTOR_ALREADY_IN_SET
ERROR_GRAPHICS_MONITORDESCRIPTOR_ALREADY_IN_SET occurs when population logic reinserts a descriptor already present in the monitor set. Possible causes include retrying without clearing partial state, enumerating the same EDID extension through two paths, or treating a driver override as an additional copy instead of a replacement.
Deduplicate using descriptor identity and provenance, not only a checksum. Two blocks with identical payloads may occupy different specified positions, while the same record should not receive a second entry merely because it was read twice. Preserve ordering where the descriptor format assigns meaning to extension sequence.
Population rules that prevent duplicate records
- Track the base block and each advertised extension index.
- Record whether data came from hardware, firmware, registry, or driver override.
- Restart the collection after a failed population transaction.
- Apply replacement policy explicitly instead of appending every source.
Microsoft: descriptor set operations
Microsoft: descriptor identity and origin fields
VESA: EDID extension standards
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