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ERROR_TIMER_RESUME_IGNORED
A timer API ignored its resumable or wake-capable flag
ERROR_TIMER_RESUME_IGNORED corresponds to Win32 error value documented as: The resumable flag to a timer API was ignored. The requested timer was created or set, but Windows could not honor the option intended to resume the machine. The timer may still fire while the system is awake, so callers must distinguish partial behavior from total failure.
Where the result appears in real systems
- Scheduled maintenance tasks.
- Backup programs asking to wake a sleeping computer.
- Power-management utilities using waitable timers.
Evidence to collect before changing the system
record timer due time, period, flags, OS edition, sleep capabilities, and current power policy; query supported sleep states; test whether firmware and administrative policy permit wake timers
Keep the original numeric value, symbolic name, API return path, thread and process identity, and the exact timestamp in one diagnostic record. Those fields prevent later layers from replacing this specific result with a generic failure and make correlation with ETW or Event Viewer practical.
Handling and recovery
Continue only if an ordinary non-waking timer is acceptable. Otherwise notify the user or scheduler that wake cannot be guaranteed and provide a policy or firmware remediation path.
Code that receives this result should classify it according to the operation that produced it: completion information, a recoverable environmental condition, or a programming defect. The result classification should be made at the API boundary where the caller still knows the handle, object, flags, and expected state.
What not to infer from this code
This result is not the same as timer creation failure. The timer object can exist even though its resume semantics were rejected.
Implementation guidance
Preserve this result through logging and telemetry instead of immediately converting it to free-form text. When it crosses an HRESULT boundary, record both the original Win32 value and the converted HRESULT; when it crosses RPC, JSON, or another protocol, include an explicit error-domain field so the receiver does not convert it twice.
A useful automated test for this Win32 error should reproduce the relevant state transition, assert the exact returned value, and verify cleanup after both the normal and exceptional path. The test for this Win32 error should also check that a retry is performed only when the underlying state can genuinely change, because unconditional retries often hide ownership, architecture, power, or resource-negotiation defects.
References
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