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ERROR_RESOURCE_REQUIREMENTS_CHANGED
a device changed its resource requirements after a successful query-stop sequence.
ERROR_RESOURCE_REQUIREMENTS_CHANGED identifies the condition that this condition Plug and Play uses this status when a device reports new requirements after the system has prepared it to stop. The change can affect interrupt, memory, I/O-port, DMA, or connection resources and requires the PnP manager to reconsider allocation.
Where the result appears
- device rebalancing.
- dock, hot-plug, and firmware-driven topology changes.
- drivers that alter operating modes during query-stop.
- resume paths where hardware capabilities differ from the earlier state.
How to interpret the result
Interpret the numeric value in the Win32/LRESULT domain and in the context of the API that returned it. Preserve this result before wrappers convert it to an HRESULT, exception, Boolean failure, or provider-specific message. When recording it, note whether the operation produced usable output; this determines whether the value is completion information, control flow, or a terminal failure.
Diagnostic evidence to collect
- device instance ID and driver versions.
- old and new resource-requirements lists.
- PnP event sequence and problem code.
- firmware, BIOS, ACPI, and bus-enumerator logs.
A diagnostic record for this Win32 error should contain the API name, input flags, relevant handles or object identifiers, thread and process identity, timestamp, and the immediately preceding state transition. Those fields are more useful than a generic screenshot because they show which contract and lifecycle phase produced the value.
Handling and recovery
A function driver should report accurate requirements and tolerate the subsequent stop/start or rebalance sequence. Administrators should update firmware and drivers when resource changes repeatedly fail, but should not manually force arbitrary IRQ or memory assignments unless vendor guidance explicitly requires it.
Retry after this result only when an external state relevant to this operation can actually change. When it is rooted in object state, unsupported capability, ownership, or invalid sequencing, an unchanged retry repeats the defect and can obscure the first useful diagnostic record.
Common misinterpretation
This code says the requirements changed, not that Windows has already failed to allocate them. The final start result and Device Manager problem code determine whether there is an actual outage.
Guidance for developers
Keep the original this result value and its Win32 domain in structured telemetry. If it crosses COM or another HRESULT-based boundary, store both the source Win32 value and the converted result. If it crosses JSON, RPC, or a database boundary, include error_domain, error_code, operation, and object_state so the receiver does not apply a second conversion.
An automated test should construct the specific state that leads to this result, assert the exact returned value, and verify cleanup on both the normal and exceptional path. The result test should additionally prove that the caller does not collapse this status into an unrelated generic error and does not retry forever.
References
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