| Previous | Next |
| STATUS_GRAPHICS_CLIENTVIDPN_NOT_SET | STATUS_GRAPHICS_CHILD_DESCRIPTOR_NOT_SUPPORTED |
STATUS_GRAPHICS_SPECIFIED_CHILD_ALREADY_CONNECTED
The display child is already connected
STATUS_GRAPHICS_SPECIFIED_CHILD_ALREADY_CONNECTED is a Windows NTSTATUS value from the graphics/display facility. It belongs to the WDDM kernel display stack rather than to a Win32 GDI error alone, so the useful context is usually the adapter, VidPN object, child device, present path, or primary allocation involved in the call.
This status is about display-adapter child devices: outputs or onboard devices enumerated by the miniport driver. It means the requested operation tried to connect or associate an external device with a child that is already reported as connected.
The usual causes are duplicated hot-plug notifications, a dock or mux transition reported twice, or stale state after sleep/resume. Do not interpret it as a second physical monitor by itself; first confirm whether the child UID and target identity are identical.
What to check
- Log child UID, target ID, output technology, and the previous connection state.
- Coalesce duplicate HPD and ACPI indications before building topology changes.
- Clear stale child connection state during surprise removal or adapter restart.
References
- Microsoft: Child devices of the display adapter
- Microsoft: Monitor hot plug detection
- Microsoft: Enumerating child devices of a display adapter
Looking for a different code? Search another status or error code.