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ERROR_GRAPHICS_UNKNOWN_CHILD_STATUS
Locate the failing graphics boundary: graphics unknown child status
ERROR_GRAPHICS_UNKNOWN_CHILD_STATUS (0x4026242F) belongs to the graphics info layer. It marks the miniport could not provide a reliable connected/disconnected answer for a child output, rather than a generic rendering failure. The object that owns the decision is display-child presence detection.
Evidence that makes the result actionable
| Capture item | Why it matters |
|---|---|
| What to capture | child UID, hot-plug awareness, ACPI/firmware state, polling result, connector telemetry and last stable status |
| Current graph state | WDDM kernel/miniport callback and the transient object state carried by that callback |
| Supporting trace | kernel graphics ETW, callback name, child or allocation identifiers, PnP state and the first returned NTSTATUS/HRESULT |
| Object identity | display-child presence detection |
| Rejected condition | the miniport could not provide a reliable connected/disconnected answer for a child output |
A controlled comparison
- Trigger a controlled hot-plug and compare interrupt-driven detection with a polling fallback.
The comparison with ERROR_GRAPHICS_DEPENDABLE_CHILD_STATUS is especially useful: ERROR_GRAPHICS_DEPENDABLE_CHILD_STATUS says the returned presence result may be trusted.
Correction and proof
Report unknown only while evidence is genuinely indeterminate and schedule appropriate re-enumeration.
- debug-layer, ETW or driver diagnostics no longer report the rejected display-child presence detection contract during the same scenario.
Technical references
- Microsoft: Graphics error codes — background for the display-child presence detection.
- Microsoft: DirectX graphics kernel subsystem
- Microsoft: Introduction to VidPNs
- Microsoft: WDDM TDR overview
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