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STATUS_GRAPHICS_UNKNOWN_CHILD_STATUS
Child-device presence could not be trusted
STATUS_GRAPHICS_UNKNOWN_CHILD_STATUS 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.
A child device of a display adapter is an onboard output or related device enumerated by the display miniport driver; the external monitor attached to it is not itself the child device. This status means the driver or display port path could not reliably determine the child status being requested.
The failure belongs to child-status reporting, usually around hot-plug detection, polling, docking, mux switching, or ACPI notification. Do not treat it as proof that the monitor is disconnected. The driver may need another poll, an interrupt indication, or corrected child capabilities before the VidPN manager can build a dependable topology.
What to check
- Log the child UID, requested child status type, and HPD awareness value.
- Correlate with DxgkDdiQueryChildStatus, DxgkCbIndicateChildStatus, docking, lid, and mux events.
- Do not remove a target permanently from topology based only on an unknown transient status.
References
- Microsoft: Child devices of the display adapter
- Microsoft: Enumerating child devices of a display adapter
- Microsoft: Monitor hot plug detection
- Microsoft: Display/graphics driver DDI overview
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